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Service Manual

1. 87 Coils check eee 98 Abbreviation 22 Compensation kit connection sa 59 Compensation essere nnne 59 Computer Board set Up 86 49 Configuration 76 Bios features Set Up 81 DC Compensation 57 Broken modules identify 30 DSP testuuu P 87 Cables eene 109 Error list explanation 23 CD ROM up u um u sus 85 DN RAA uu h EE 85 Check X 112 Chipset features 82 Fujitsu M2513 Optical disk drive 85 153 8300096009 VER D Index 154 Gain gradient 117 2 a c eene e e ees 107 Gradient driving transmitting chain 107 H Hard disks nein aati aid Stine 85 Heaters ie ENG br 123 Ec a es 44 Image quality 49 Images BacK uD ua ana eave 65 Images Restore 77 Images visualization and storing
2. 14 Overview 7 Parl 3 System 15 General 7 Strate 15 DIStrIDUUOn 8 gy Service Manual 2 8 System functionali 3 m eee o 15 Part Service Policy 11 Syst m error Meme P 22 Window messages text 22 Abbreviation 22 Syinbols ts6d iia ug 22 Product Line Support Center 11 Error messages 23 Broken Modules ldentify 30 Sales and Service administration 11 Ordes 12 Procedures 31 3 8300096009 VER D Table of Contents Recording files 31 Rec filelist u 32 Service RecFilePlot introduction 36 Monitored 37 System Check 39 36 ec mL M 39 FUNCIONS sas uu 39 Image quality 44 Common interference problem analysis 44 General problems regarding 47 Detecting artifacts on images 49 Shielding
3. 79 Interference problem analysis 44 L line voltage uuu u 145 M n eee o HR ea RERUM E 121 Magnetic 55 ii PEERS 149 Monitored quantities seem 37 N Necessary tools nnnm rete iter 109 Operating System SW Installation 66 OPI SW Installation sees 71 P Patient Handling s uui cte tr etes 105 n tete ette tate tte est tette 11 sas idiom abu ue e opes 143 Power management 83 84 Problems regarding 47 R Receiving Coll ett re te eg 101 RecFilePlot 36 Recording files teinte eet ne Eon eon 31 Repair Instructions u u uu u uuu uuu 80 Repalt TX ua te cepit 99 S at hi asti as 97 S shies Satu E E 95 RX Chain driVing s a 92 5 SOS 85 SENSOMS iiec 123 Shielding 4 52 SHIMMING s l P n uqu nu us 128 Shimming Parameters sese 130 shimming pla
4. 85 CD ROM eiie ete teres leben eee aad 85 GA E 85 Computer board 2 Part6 Control 87 Trouble Shooting Strategy Procedure PS PACS az l Suni eh NAI M Necessary 0 5 iuri Repair instructions Change DSP iin EHI EEE Change CNTR or TRDIFF boards 7 RF Subsystem 89 Trouble Shooting Strategy General Procedure Transmitting Coil Use of System Receiving chain driving en 95 Procedure M 95 TR 95 Procedure eE 95 algiWehrle qc 97 PIOGCGQUIG peret bes Erde 97 Transmission Coil 97 Receiving Coils 98 Repair 99 Transmission 99 Necessary 0 99 urIcu MP 99 mc 101 101 Necessary 101 Hardware Connecltions 101 Check Procedure 4 4000 1000000 102 Part Patient Handling 105 Trou
5. 52 Necessary ee ederent 52 52 Repair 55 PHOCOGUIG 55 Magnetic Compensation 55 DC Compensation 57 AC 4 40 0 0 59 Part 4 Software 63 Trouble shooting strategy 63 Procedure 63 Configuration 2 63 Images Back Ups tnter et 65 66 Complete Software installation 66 Operating System SW Installation 66 Operating System Service Pack Installation 69 OPI SW 71 Configuration restore 76 Images 440 44 2 111 77 Part5 Host 79 Trouble shooting strategy 79 Images visualization and 79 Procedure 79 Repair instructions 80 Mother Board 80 Standard CMOS 80 Bios features set up sese 81 Chipset features 82 Power management 83 PNP and PCI 84 85 Fujitsu M2513 Optical disk drive
6. The most important parameter of the gradient waveforms is the rise time It is the time that the gradient takes to reach the 99 of its maximum amplitude value To measure it put the test on pause move the cursor on the waveform and read the meas ured values in the small panel on the right bottom corner Use the WINWOS calculator to compute the values START Programs Accessories and Calculator In this example the TIME scale is set to 1 msec 8300096009 VER D 115 Gradient Repair 116 e In the next figure it s possible to see the most common cases of e f this condition is not satisfied adjust it using the T1 T2 and T3 incorrect gradient wave form trimmers looking for the better compromise between the rise time and the gradient linearity To have an idea how the trimmers Low rise time rotate the T1 clock wise work see the next figure Overshoot rise time too fast decrease the T2 counter clock wise f I Correct rise time good compromise between overshoot and NOTICE If any gradient adjustment is necessary remove rise time the pause function NOTICE Gradient rise time 99 lt 500 us Don t set the rise time under 400 us very fast rise time don t increase the image quality NOTICE The higher trimmer acts also on the previous portion of the gradient waveform Fig 80 Trimmers working area Fig 81 Example of rise time correction
7. Stress Temp Power UP INNER DOWN OUTER DOWN INNER and UP OUTER Temperature power associated with each of the four heaters Environment temperature Central precession Larmor frequency of static magnetic field Like in all the other system features the scales can be set by the user to better visualize the history data Fig 14 History file Diascope visualization 55 fesses one wana 21 Cortes Sosa System Check Description The lt System Check gt menu contains several functions allowing the operator to perform various checks of the system operation After entering this environment the system will display Diascope instrument Operation Perform the following operations to access the lt System Check gt environment Turn on the system and wait for the operator interface to appear on the screen If after 20 seconds no error messages are dis played recoverable error Scan disabled this means that the computer has successfully completed its self configuration all modules are present and is receiving the basic clock for control and acquisition from the SINT module Open the ARAS program then select lt Tests gt lt Hardware gt lt System check gt and press lt Run gt You have now entered the lt System check gt environment from which you can test the apparatus electronics After approx 10 seconds you will hear the noi
8. 71 E093 2004 Zo CD Content Scan 8 14 Update EMRI Scan B 1A Irwtatation Operating System Service Pack 3 Installation Aros Win 81A Installation e Select the Operating System Service Pack3 Installation and the system will ask you to insert the activation code Fig 40 Selection page code request THE IMAGE OF INNOVATION 19908 2004 anode ZpA CD Content E MRI Scan B 1A Update E MRI Scan 8 14 Installation Operating System Service Pack 3 Installation Aras Win 8 14 Instaliation Presse enter the progam key ex Sua A ari we 2202 de Write 1209 and confirm it pressing the OK button to start the patch installation 8300096009 VER D 69 Software Repair 70 Fig 41 WIN2000 SP3 installation Fig 42 WIN2000 SP3 installed 1 Operating system updates Operating System Service Pack 3 ESAOTE The update procedure is finished THE IMAGE OF INNOVATION Press Fish to reboot the system ROTE After the reboot check the Internet Explorer home page tim lo verify the successfully completion of the operation M j Update progress status Operating System Service Pack 3 Installation Aras Win B 1A Installation e Perform log as ADMINISTRATOR no password required inen pee rere rn K lt
9. Fig 103 System Power Led and Power Cable connection Check if the feeder circuit breaker is switched off Check if the main system fuse is interrupted Check if the secondary system fuse is interrupted Check if the insulation transformer input and output are correctly set Repair Checking the line voltage Lock all emergency shutdown buttons Prior to switch on several adaptations to the line voltage must be made Ask your project manager about the on site line voltage and perform your own measurement The on site line voltage is Switch off the on site power supply and secure it with a lock to prevent anyone from inadvertently switching it on Adapting transformer to the line voltage Check if the primary stage of the insulation transformer is correctly set for the main supply voltage of the country where the system is installed Refer to the figure for transformer settings Use the cables supplied for the additional bridge if necessary The insulation transformer is inside the Magnet basement beyond the Magnet Connection Panel as shown in the next figure Fig 104 Insulating system transformer 145 8300096009 VER D Power Distribution Repair 146 105 Possible transformer voltages NOTICE The secondary voltage from the console trans former is 220V Check if the main fuse ha
10. Use of the System Check Select lt Test gt lt Hardware gt lt System check gt and wait for the dia scope then click on the lt Channel gt button and from the drop down list you can select the three channel Gradient output X and 2 When you select channel 0 the first line at the top right corner of the monitor shows the label X Grad channels 1 represents the Y GRAD and channel 2 2 GRAD The blue trace real component is the driving voltage of the gradi ent amplifiers X channel GRA module measured at the output of the CNTR module located in the control box unit The red trace imaginary component is the output current of the GRA X channel measured by shunting a part of it from the corre sponding final stage The sequence used by System gt is designed specifically to examine the variables concerned X gradient Y gradient or Z gradi ent If the coil relative to the Y gradient is driven correctly the monitor will display this waveform use the Res Div and Dec gt commands to display the optimal dimensions for both channels A and B Please note that the GRA drive voltage blue trace must have a rather square shape since it is driven directly by the D A except for gains and offset Whilst the output current red trace besides the different gain value shows overshoots and undershoots generated by the eddy current compensation circuit located at GRA input
11. 8300096009 VER D 13 Product Line Support Center 14 Not all the out of warranty modules will be authorized refer to the Repairable Item list Print out the received RMA authorization form and place one copy on the shipment crate Send the goods to the following ad dress ESAOTE S p A Via Montecchi 5 16153 Genova ITALY Att Antonio Toso NOTICE The shipment without RMA authorization form attached will be rejects In case parts have not been accepted for repair a Notice of Rejection detailing the reasons will accompany goods Make two orders and send them to silvia bottino esaote com by fax 39 010 6547275 under warranty modules at price zero out of warranty modules insert the price contained into the Re pairable Item list 50 off of the Spare Part list NOTICE Indicate on the order the RMA number Warranty after repair If originally out of warranty those parts are warranted after repair for a period of ninety days from ESAOTE shipment If in warranty parts will be covered by saleable warranty or by the extended ninety days whichever is greater As an example should the saleable warranty by expiring in 60 days after repair warranty will be applied System Strategy In this chapter you will find test strategies encompassing the com plete system System functionality All modules present in the system are necessar
12. Any Defective item under warranty shall be returned to ESAOTE for repair substitution Parts declared repairable in the Spare Part Price List are not accepted once warranty expires Parts or products cannot be returned for upgrades unless the upgrade has been previously agreed in writing with ESAOTE Parts damaged because of traumatic events or improper han dling example non authorized modification or improperly per formed modification will be automatically considered out of war ranty and can be declared non repairable by ESAOTE Complete products cannot be returned for repair unless quested by ESAOTE or previously agreed in writing Procedure for returning goods to ESAOTE NOTICE The modules shipped without following the cor rect procedure won t be accepted Follow this procedure to send back any item for reparation e Fill the Trouble Report one for every broken module Make copy of the T R contained in this manual Fill the T R number field following this criteria XX 001 01 XX Distributor initials ask Service Dep 001 Progressive trouble number 01 Current year Leave empty the ESAOTE T R number field NOTICE If you don t have the T R form download it from the ESAOTE web site e Send the filled T R by fax to the attention of or by e mail to mri service esaote com or christian deferrari esaote com f you want to send the broken module t
13. Fig 99 Parameter insertions 10 GetieienotesXOP SCAN TXTX Code OK 11 Getfle Remote PROTO_PRD Locals GetFile nde 2 2 cosine 23 out of specifi cation 2 2 cosine 23 out of specifi cation 2 2 sine 5 specification 2 2 sine 0 Check if the suggested positions are empty and only in this case Example Real values are Inserted values will be 2 0 cosine 8 in specification 2 0 cosine 0 2 1 cosine 7 in tion specifica 2 1 cosine 0 2 1 sine 0 as default 2 1 sine 0 as default accept the solution clicking on the lt Yes gt button If there are not empty click on the lt No gt button and the system will provide you another solution The solution is compound by First line parameter s need to be adjusted Second line on if the blocks are more than one block di mension of neodymium necessary to compensate the above in homogeneity parameter s Third line polarity of the blocks positive or negative Fourth line the co ordinates radius and phi of the blocks on the shimming plates Every position has other three symmetrical positions Only the positions on the horizontal or vertical shimming plate axis have just one symmetrical position Remember that all the pieces are glued symmetrically it s enough to check one position to be sure that also the others are emp
14. Fig 71 Gradient waveforms Lj re If the blue track GRA input is correct but the red GRA output is not there is probably a problem is related to the gradient amplifier If the blue track is not correct as well probably the problem is re lated to the CNTR module or DSP which programs CNTR Obviously using the apparatus as an oscilloscope assumes that the acquisition subsystem consisting of the DSP and ACQ modules is operating correctly Any problems with this subsystem must be identified if for instance the oscilloscope behaves incorrectly re gardless of the selected channel In this respect note that channels 3 4 5 and 6 have special significance since the values being dis played are generated internally by the acquisition subsystem The GRA module gradient amplifier is placed into the electronic unit at the right magnet side patient view Follow this procedure to replace it Open the front and rear electronic unit covers left side Disconnect the GRA power plug rear side Disconnect all the cables front side Take out the broken module and insert the new one replacing all the cables GRA gradient check Necessary tools Gradient Tuning Kit e Allen key 4 mm e Screwdriver small and big standard tip Cables connection e Switch off the system Open the left electronic unit cover patient side e
15. RIB UNIT VA GROUND 1362 114 Ps dH pT INSULATION TRANSFORM 8n no in FOR CABUNG DF THESE POINT SUE PANAR DN THS DRAWING BELOW BEEN REPORTED THE CARUNG FOR HIV SUPPLY PTRS BED 1355 ic BTX BS 1359 if ie gt veas ni o versn iya 1 O GRXY2 BES 1353 113 8 THPS 1361401 1305 tt MA ET FAST HEATERS IMELFOR THE ASSENBLY OF THE CONNECTORS OF CABLES MAGNETIC UNIT BASE PLANT VIEW 8300096009 VER D 19 System Strategy 20 Fig 5 Right Electronic Unit front side RFA UNIT 91 1596 110 SW2 882 49101 5 862 1012 111 POWER DISTRIBUTION BOX 911 1333 003 RIGHT ELECTRONICS BOX FRONT VIEW Fig 6 Right Electronic Unit rear side 1 0 32704 8300096009 VER D System Strategy 21 22 System error list Window messages text syntax Error error code message Scan disabled The control is turned off and an unrecoverable error is indicated the operator must click the cancel button to exit the message window Warning error code message Do you want to proceed There is a recoverable error and t
16. Set the Frequency to 5K to visualize a larger bandwidth at least 20 kHz from the central magnet frequency Set the Y axis to 1K central peak appears 15 the SINT oscillator and means that the Phase and Quadra ture offsets are not properly calibrated to the zero level The meaning of this test is check if any radio frequency peaks appear close to the magnet central frequency in dicated by 0 kHz if they ap pear they can generated noises on the images 45 8300096009 VER D System Procedures 46 Fig 21 Example of frequency modulation Fig 22 Example of artifact due to the present of spikes General problems regarding noise This section covers some problems regarding high noise levels in the system room and their possible solutions These kinds of problems could be generated by several things such as the power line cable lacking a good filtering system net work lines to transmit data between different computers the laser camera installed close to the system or any other source not per fectly shielded In all these cases the normal noise level increases until it exceeds the warning noise threshold to the detriment of the quality and resolution of the images so obtained This is to say that everything line cables personal computer net work cable central phone line etc in the room must be checked very carefully before installing the system to avoid any pro
17. Yes USB IRQ Enabled NO ICU VGA BIOS Sequence Yes NO ICU NO ICU NO ICU NO ICU NO ICU NO ICU Hard disk The hard disk must be set at Primary Master Look for the jumpers at the back of the HD and look at the labels at the top for their cor rect configuration Fujitsu M2513 Optical disk drive Set the DIP switch in the upper part of the ODD 3 1 2 as follows Tab 5 SW1 JUN NNI n 05 SCAMmode mode off Disabled Device type mode for INQUIRY Fixed disk 07 Spindle automatic stop mode automatic stop mode off Disabled 8 CD ROM Must be set Secondary Slave and connect to the Secondary IDE port of the Mother board data bus CD RW If present must be set like Secondary Master and connect to the Secondary IDE port of the Mother board SCSI Changing from the Adaptek 2910 to the Tekram Ultra SCSI DC 315U follow this procedure if the Tekram board was already in stalled it s enough to change it mechanically Switch off the System and open the Computer case Remove the SCSI board and install the new one Close the Computer case and switch on the System Perform the log on like SERV e Minimize the window e When the window Found new hardware Wizard appears select the Search for a suitable driver for my device rec ommended and press NEXT e Select Specify Location and in
18. Pulse value The 180 rec file is also filled in during the Service automatic calibrations Looking at this file is possible to understand when the system wasn t able to calibrate the pulse and why the images went black for example 33 8300096009 VER D System Procedures 34 9 c http localhos Sampling rate 19531 max Signal 32767 frequency 7894270 zero crossings 12 Step Hz 456 new freq 7893614 zero crossings Step Hz 836 neu freq 7894650 crossings selected frequency 7894650 Sampling rate 19531 max signal 32767 frequency 7694270 zero crossings 13 Step He 456 neu freq 7893814 zero crossings Step Hz 912 nev freq 7894726 zero crossings Step Hz 152 nev freq 7894878 zero crossings Step Hz 304 new freq 7694574 zero crossings Step Hz 1S2 new freq 7894422 zero crossings Step Hz 228 neu freq 7894650 zero crossings Step Hz 76 nev freq 7894726 zero crossings Step Hz 152 neu freq 7694574 zero crossings Step Hz 152 neu freq 7894422 zero crossings Step Hz 304 new freq 7894726 zero crossings selected frequency 7894650 OU t Sempling rate 19531 max signal 137 frequency 7894649 There 13 no signal Central frequency 7694649 Starting frequency 7664649 searches 100 Can t calibrate frequency Sampling rate 19531 max signal 19676 frequency 7894270 crossings 11 Step Hz 3
19. 1910 E RF amplifier failure gradient failure 1911 E RF amplifier failure gradient amplifier not powered and gradient fail 1912 E RF amplifier failure cterm failure 1913 E RF amplifier failure cterm failure and gradient amplifier not powered 1914 E RF amplifier failure cterm failure and gradient failure 1915 E RF amplifier failure cterm failure gradient amplifier not powered and gradient failure 1916 E RF amplifier not powered 1917 E RF amplifier not powered gradient amplifier not powered 1918 E RF amplifier not powered gradient failure 1919 E RF amplifier not powered gradient failure and gradient amplifier not powered 1920 E RF amplifier not powered cterm failure 1921 E RF amplifier not powered cterm failure and gradient am plifier not powered 1922 E RF amplifier not powered cterm failure and gradient fail ure 1923 E RF amplifier not powered cterm failure and gradient fail ure gradient amplifier not powered 1924 E RF amplifier failure RF amplifier not powered 1925 E RF amplifier failure RF amplifier not powered gradient amplifier not powered 1926 E RF amplifier failure RF amplifier not powered gradient failure 1927 E RF amplifier failure RF amplifier not powered gradient failure and gradient amplifier not powered 1928 E RF amplifier failure RF amplifier not powered and cterm failure 1929 E RF amplifier failure RF amplifier not powered cterm fail ure an
20. 4 Fig 62 TX Coil Circuit Necessary Tools Non ferromagnetic screwdriver Kit capacitors for Transmission Coil tuning Solder VARIABLES TUNING Operations CAPACITORS 4 CAPACITORS MATCHING If the transmission peak is not correct first of all remove the trans CAPACITORS mission circuits cover removing the four screws in the cover cor ners in order to access the transmission circuits MATCHING AX WARNING Don t touch the TX Coil circuit when 5 the Gain is set to 180 to avoid elec tric shock the provided power is very high e f the variable capacitors are not sufficient to reach the correct frequency you can solder another capacitor if it s necessary to Tuning increase the capacitance in the close to the already soldered Using the variable capacitors present on the tuning circuit you capacitors ar over them r their values can move the pulse at maximum 100KHz 50 2 The vari able capacitor position is shown in the following figure 99 8300096009 VER D RF Subsystem Repair 100 Fig 63 Example transmission peaks FO Increase capacitor FO Decrease capacitor Fig 64 TX Coil Circuit Layout VARIABLES DIODES CAPACITORS LEFT MATCHING CAPACITORS TUNING CAPACITORS RIGHT MATCHING CAPACITORS Matching e f the pulse is lower than 12dB you must increase the match
21. 6 Low Overshot Correct rise time decrease rise time 5 increase trimmer 2 4 trimmer 1 Repeat the same procedure for the and Z gradient moving the pick up coil to the correct position and selecting Y gradient gt and lt Z gradient gt from the lt Hardware gt menu Gain gradient calibration Geometrical distortion test Introduction In order to check the image quality from the point of view of dimen sional accuracy use the pins fitted for this purpose in the geometri cal phantom The distance between the pins of the various squares as recorded in the calibration protocol may be measured with the lt Distance gt tool in the OPI toolbar Slash icon zooming in the images if nec essary in order to reduce any measurement errors When moving the phantom it is recommended that the scout be repeated so as to ensure its exact position errors exceeding the maximum permitted value occur it is also necessary to check that there are no shimming problems perhaps due to any ferrous objects placed inadvertently in the gantry Necessary Tools Geometrical Phantom and its supports L key 4mm Screwdriver small and big standard tip Screwdriver medium Philips tip Operations Position the Knee Coil 2 with the geometrical phantom placed in an axial position using the suitable support Perform one scout to check the phantom position and calibrate the system to the phan
22. counter to 0 0 0 Connect the pick up coil to the COIL IN bnc of the AINT box and place it into the magnet at the X position of the gradient tuning support Fig 33 Connection for AC Compensation System normal connection TERM Control Units SINT x AC Mag Compensation RFR CTERM Control Unit SINT T RFR2 RFRj Ifl p 1 PickUp AINT box DC AC 8300096009 VER D 59 System Repair 60 Connect the AC probe to the bnc the module Compensation From the ARAS program select lt Test gt lt Hardware gt lt NOTICE Ifthe DC probe is not installed you must connect AC gt blue internal field red external to the DC probe connection of the CTERM mod ule the enable connector contained into the AC DC compensation kit Fig 35 Internal field not compensated Fig 34 AC Probe and its support e Rotate the AC trimmer counter clockwise remove the factory compensation effect until you hear the click Keeping the probe horizontally and with the output cable in the magnet direction move the 50Hz probe to find where the AC noise is strongest This is where the noise is coming from fix the probe on the wall using tape Place the AC probe between the magnet and the noise source The best probe po
23. 02 11 5 15 2001 9 12 23 Gain Transverse Geometrical distorsion measur amp Done 02 11 5 15 2001 9 18 43 AM Nomi Fig 83 Zoom image to reduce measurement errors the measurement has an error exceeding 1 of the ideal value calibrate the gain of the X gradient rotating the X trimmer 7 one turn 0 4 mm NOTICE The reference values for the pins at 60mm are 59 4 mm 60 6 mm Position the Knee Coil 2 with the geometrical phantom placed in an coronal position using the suitable support and perform a Scout Click on the OPI lt Protocol list gt on lt Geometrical Distortion Measurements gt and then select the sequence lt GRZ Gain transverse gt Display the reconstructed image in format 1 Zoom in the image if necessary Select lt Distance gt icon and measure from the upper pin to the Position the Knee Coil 2 with the geometrical phantom placed in lower pin vertically from edge to edge between the pins 60 mm an sagittal position using the suitable support and perform a If the measurement has an error exceeding 1 of the ideal Scout value calibrate the gain of the Z gradient rotating the Z trimmer 7 Click on the OPI lt Protocol list gt on lt Geometrical Distortion one turn 0 4 mm Measurements gt and then select the sequence lt Gain transverse gt NOTICE The reference values for t
24. 2 1 Cos Calculation Calculate ppm 21cos 212 68 x E FO NOTICE FO is the central frequency of the magnet in MHz 176 81 Identify the co ordinates of the four points corresponding to the 2 2 Sin pins of the geometrical phantom located at a distance of 48 pix Load the correct image from ARAS 96 2 2 DODP as See Re W srv000011 dcm E Scan Manage 10 Getfie Remote GetFile Code 11 Getfile Remote GelFile Code 20 CoiConnect 176 84 e Identify the co ordinates of four points corresponding to the pins of the geometrical phantom located at a distance of 48 pixels from the center A B C and D in figure To do that move the mouse prompt on the image and on system will show the coordi nates on the left bottom corner Ais in the bottom left part Its co ordinates 80 and A must be measured by putting the mouse cursor exactly at the center of the black pin B is the top left pin Its co ordinates 80 B where B must be measured by putting the mouse cursor exactly at the center of the black pin C is the top right pin Its co ordinates are 176 C where must be measured by putting the mouse cursor exactly at the center of the black pin D is in the bottom right part Its co ordinates 176 D and D must be measured by putting the mouse cursor exactly at the center of the black
25. From the CONTROL PANEL gt window select the Add Remove Programs icon then Add Remove window components and wait for the System refresh then check the Internet Information Services box and press NEXT wait for the end of the installation procedure then press FINISH and CLOSE From the CONTROL gt window select lt SYSTEM gt icon then Hardware Device Manager and verify that all the System Peripherals are correctly installed No or 2 signs close the components otherwise select the Device the press the right mouse button and then press Up date driver choos 8300096009 VER D 67 Software Repair ing the correct drivers form the DRIVER CD provided with the System Remove the inserted CD and re boot the System Type the DEL key during the BIOS boot and enter in the BIOS SETUP menu typing the correct password Select the BIOS FEATURES SETUP menu and set the following Boot Sequence using the PAG UP PAG DOWN keys C only Quit from the BIOS SETUP saving the new configuration Go ahead with the following procedure 68 Operating System Service Pack 3 Installation CAUTION Perform this procedure before the OPI instal lation The patch is contained into the ESAOTE SW Release CD ROM e Insert the ESAOTE CD ROM into the CD ROM driver The following HTML page will be automatically displayed Fig 39 Selection page ESAOTE THE IMAGE OF INNOVATION
26. NTC board that is installed on the magnet basement right beyond the magnet connection panel F connector Resistors are fitted to the board and their values are calculated by taking note of the value of the thermal sensors in the magnet This means that every magnet has its own NTC board To check if the magnet is at the correct temperature perform the automatic temperature test present in the ARAS program under lt Test gt lt Automatic gt lt Temperature gt This test will give some information shown in the following figure Fig 84 Automatic temperature test gt gt x 33 DDD Es Aen us conc p lt ANE gt REC FILEX fie Ves trie Imp If you want to visualize the temperature in real time to evaluate any kind of temperature instability another test is available This test is called System monitor and is under Test Hardware This test allows you to follow the magnet temperature and power in real time for every channel Each channel displays the power output to the heaters gray track and the temperature error detected by the two sensors white track located on the side being monitored No value be changed since the thermal subsystem is inde pendent from the personal computer it also works when the com puter is off the behavior is correct we should
27. Procedure 96 Fig 60 System Check window EEE blue trace is the JU UE B PAESE TAP direct pulse the en la 4 S gt G SE WE ergy that the RFA is gt fem zg transmitting to the Tm Gantry 2800187 POE samieis i6 The red trace is the energy that we are losing because the 2400 my CC M m Gantry is not equal to ME the ideal load 500 It Center Seale must be lower than 2000 xv som xi 120 of the direct vow pow fs pulse al If the red trace is flat means that the SINT module is broken or the cable between 1200 Peli SINT and RFA If the blue trace is flat disconnect the output 1600 1600 800 800 mv cable and connect dummy plug 50Q to the RFA output if the SE trace is still flat means that the RFA is broken otherwise the Gantry 0 mv f pit or the cable are bro ken 7400 32 64 96 128 160 192 224 256 UON w 157 407 2279 167 mV 8 2279 167 mV Net local NUM The RFA module is the system s power amplifier It is located inside the system console Procedure From the ARAS program select lt Test gt lt Hardware gt lt System Check gt lt Run gt Click on channel and select the seventh channel as shown in the previo
28. after 35 reading Found 2 elements for calibration class 5 Original value 166 calculated ratio 21442 23467 10944 echo 1 slice 1 max 14360 posit 256 gainl 133 calculated ratio 11193 14758 13185 value 184 calculated ratio 11222 14821 13206 value 182 calculated ratio 10909 14941 13696 value 180 calculated ratio 10754 14926 13879 value 186 calculated ratio 11160 14818 13253 value 188 calculated ratio 11581 14749 12735 value 190 calculated ratio 11776 14725 12504 value 192 calculated ratio 12075 14554 12053 value 194 calculated ratio 11964 14641 12237 value 196 calculated ratio 12169 14574 11976 value 198 calculated ratio 12193 14601 11974 value 200 calculated ratio 12374 14434 11664 value 202 calculated ratio 12307 14518 11796 value 204 calculated ratio 12454 14346 11519 value 206 calculated ratio 12503 14329 11460 value 208 calculated ratio 12678 14095 11117 value 210 calculated ratio 12613 14167 11232 value 212 calculated ratio 12666 14035 11063 value 214 calculated ratio 12726 14020 11016 value 216 calculated ratio 12727 13760 10811 value 218 calculated ratio 13772 10874 gain2 0 The 180 Pulse calibration is automatically done by the system every scout acquisition to calibrate the necessary energy to rotate the spin during the sequence acquisition The 90 Pulse is automatically calculated by the system starting from the 180
29. data that has not been saved To make software trouble shooting as effective as possible some procedures to assist you in dealing with software problems are given below Procedure Configuration Backup This function allows the creation of a copy of the system calibration data and user s protocols and configurations but does not save the customer s images To create a system back up Log on the system like SERV typing the correct password and click on the Internet Explorer icon e Insert a optical cartridge into the ODD 3 From the homepage select Configuration Management and Backup amp Restore like shown in the next figure e Follow the SW indications 8300096009 VER D 63 Software Trouble shooting strategy Fig 37 Configuration backup 64 soft Internet Explorer DEDICATED MRI ARTOSCAN C Chean Backup amp Restore ESAOTE On line Remember to save the system configuration to an Esaote Service Configuration Archive with the Backup function whenever a Service Maintenance is performed Anytime you can retrieve from a compliant Esaote Service Configuration Archive the system configuration settings with the Restore function This page allows to create the system software back up Don t create the system back up immediately after the installation but do it during the first maintenance when the system parame ters are stabi
30. error from MIF interpreter COl and DSP scan execution time 201 E bad input to scan execution MIF command 202 E system call error 203 E check error during preliminary phase of scan execution 204 E an error code has been returned by DSP during scan execu tion 205 E error during reconstruction on DSP board and DSP acquisition time 302 E system call error 303 E data loaded from DSP have size greater than expected sequence compilation time 401 E bad input to compile MIF command 402 E system call error 403 E check error during compile time 406 E syntax error on sequence source file scan data load time 501 bad input to scan data load MIF command 502 E system call error 503 E check error verifying scan data coherence 506 E format error on scan data file 507 E format error on predef file and DSP quit time 601 E bad input to quit MIF command 602 E system call error 604 E error from DSP performing the quit command COI load scan vocabulary time 701 E bad input to load scan MIF command 702 E system call error 703 E check error during load time 706 E syntax error on vocabulary file 8300096009 VER D 23 System Strategy 24 and DSP initialization time 802 E system call error 803 E check error verifying execution environment and data struc tures loaded from DSP 804 E an error has been return
31. frequency taking care of the inserted load Every Coil has its own Varicap value when you save it manually don t overwrite the other values Calibration class Original value 76 found max 31426 posit 216 echo 1 slice 1 max 3408 posit 222 gaini 127 gainz O echo 1 slice 1 max 13526 222 gaini 196 gain2 0 nev value 74 max signal 14331 nev value 72 max signal 14592 2 nev value 70 max signal 14723 The rec file is filled in by the system every time Also the Varicap is automatically calculated by the system during every Scout acquisition melts 45 the varicap is calculated either when is done new value 64 mex signal 15164 automatically or manually by the Service techni nev value 62 max signal 15312 nev value 60 max signal 15426 clans new value 58 max signal 15496 Dew VAINAS 26 NE 15950 If the Varicap is not correct or cannot be calcu new value 54 15686 new value 52 15792 lated by the system means that an error in the re new value SO max signal 15909 V new value 48 max signal 16078 ceiving channel occurred nev value 46 max signal 16124 nev value 44 max signal 16123 nev value 42 max signal 15979 new value 40 max signal 16019 nev value 38 max signal 15994 nev value 36 max Signal 15911 neu value 34 max signal 15858 value 32 max signal 15720 Calculated value 46 Calibrat
32. on the lt Channel gt icon to display the power output to the heaters or on the lt Dual gt button to display them together Press lt Scale Div gt to set the correct value of the scale on the Y axis for example 1m C for the temperature error and 15 Watt for the power output to the heaters Then with the mouse cursor click on the signal trace to obtain some information about it in the information window Environment temperature control The lt System Monitor gt environment makes it possible to also dis play external temperature As a matter of fact a particular probe is placed outside the system to check the external temperature so that you can understand if something has changed in the external conditions To check this parameter you must enter lt System monitor gt and set the logical channel 4 A WARNING _ Before performing this test check if the correct CTERM offset values serted under lt SERVICE gt lt TOOLS gt lt SYS 5 gt The correct temperature value can be monitored but you must probably change the scale on the Y axis with the lt Scale Div gt Button in C and the lt Displacement gt button to improve the signal display At this point you can find out the exact external temperature value by clicking with the mouse on the signal trace Operations Enter the service software ARAS and select lt Test gt lt Hard ware gt and lt System Monitor gt
33. quality images are obtained Detecting artifacts images Simulation of examinations After performing all the system s calibrations and the relative quality tests check that the system is operating smoothly by performing scans on patients using different sequence types GE Spin Echo Turbo Multi Echo etc For this type of testing perform several acquisitions on all the four coils and assess the quality for each type of sequence More specifically the images obtained must be observed in order to exclude the presence of artifacts such as lines light spots bands etc and magnetic fluctuations in DC mode e g blurring and in AC mode e g ghosts In order to check that the signal noise ratio is good and that the contrast is appropriate Consider that some related problems for instance lines spots etc may be caused by RF external frequencies RF frequencies within the system due to the failure of hardware modules Fig 23 Radio frequency probably due to external factors 49 8300096009 VER D System Procedures 50 Consider that some related problems for instance ghost images may be caused by Phase and quadrature offsets a long way out of the zero level Fluctuation of the signal due to external fields at about 50 60 Hz and 16 6Hz Fig 24 Ghosts generated by external 50Hz Consider that some related problems for instance out of fo
34. railways close to the site Perform compensation during working hours when all the Systems are on and the noises are usually stronger 8300096009 VER D 55 System Repair Fig 29 module front and rear side FRONT SIDE Eg dig 1 5 j P Tm Gy 000000 fe O O oO O O O Offam tk Zx 4 AC PROBE Z Na e o o0 0 6 DON T DIP SWITCH 1 LSB 8 MSB TOUCH AC TRIMMER DC TRIMMER REAR SID ge er a On the CTERM module front side all the Magnetic connec tions are present Also the trimmers dedicated to the Magnetic compensation gains and the trimmers dedicated to the Ac magnetic compensation phase are placed on the CTERM front side On the rear side there are the CTERM fans and plugs The upper plug is the power supply for the unit The mag net fast heaters are con nected to the lower plug and the CTERM module provides or not powers to them auto matically 56 DC Compensation Select lt Test gt lt Hardware gt lt CMAG gt then lt Run gt Set the Diascope visualization settings in order to visualize both traces inside the test window NOTICE probe must be fixed on the wall at the end of
35. set 7798 to zero along the entire cali MS bration If the offset is not to zero the gradient waveform is not cor rectly visualized and seems that its linearity is not perfectly flat In this example the rise time is a bit too fast and it gener ates an overshoot on the gra dient waveform it will be compensated before the measurements decreasing the trimmer 1 and increasing the trimmers 2 and 3 113 8300096009 VER D Gradient Repair 114 To check the gradient linearity change the TIME visualization scale till to visualize the entire waveform In the previous figure the TIME scale is set to 1 msec in the next figures is set to 2 msec and 10 msec Fig 77 TIME scale set to 2 msec Fig 78 TIME scale set to 10 msec Put the Diascope on pause Check the gradient waveform measuring the rise time and the gradient linearity For the rise time you must use the mouse ar row and measure when the signal moves up and when the gra dient is the final condition Calculate 99 of the value ob tained and put the second marker on the result value It corre sponds to the raise time and must be lt 500 us The next figure is an real example of gradient waveform Fig 79 Rise time measurement Pee ee amplitude 799 of the gradient Rise starting point Gradient
36. the magnetic compensation procedure use tape e Rotate the DC trimmer counter clockwise remove the factory to fix it during compensation compensation effect until you hear the click Remove the console front covers plastic and metallic Fig 31 Internal field not compensated Connect the DC probe to its connector on the CTERM front side Fig 30 DC probe Check that the internal field has the same shape as the external e Pur the one since in the previous step any kind of compensation is re inside 57 8300096009 VER D System Repair 58 moved as shown the next figure The internal field is the dif ference between the internal noise due to the external magnetic variations and the signal we sent to the magnet to compensate the external noises Fig 32 Internal field with compensation Keeping the DC probe horizontally at the same magnet center height and with the out wire in the magnet direction move it along the wall to identify the direction of the noise Leave the probe where the external noise is strongest Rotate the DC trimmer clockwise flattening the white trace inter nal field till to meet the specification maximum 1mG NOTICE Un checking the Automatic Scroll option inside the Scope menu it s possible to modify the Time division Change the level division scale of the internal DC field to display it better as shown in the next figur
37. them might cause the undesired change of the other magnetic field parameters Therefore it is recommended to perform all the re quired steps and in particular the correction procedure with the utmost care NOTICE Open the magnet remove the shimming plates leave them outside for 5 minutes then insert them back before to perform this procedure Necessary tools Shimming Allen key 4 e Screwdrivers flat and Philips Geometrical Phantom and its support Coils 1 2 and 3 Fig 89 Shimming Flowchart Shimming flow chart Acquire the Homogeneity Verification images HMGE and HMSE From OPI acquire the Shimming images taking care to select the sequence insert the coil and place the phantom in according to the shimming procedure From ARAS select the images and calculate the shimming parameter values At least on parameter is out of spec Insert the shimming values out of spec and wait for the software solution Remove the shimming plates then check if the suggested positions are empty Is the solution acceptable Calibrate the GE and SE sequences then acquire the Homogeneity Verification images HMGE and HMSE Compare the new Homog Verification images to the images acquired at the beginning and check them against the grid Remove the shimming plates glue the neodymium pieces and close the magnet Type NO and wait for anothe
38. to a normal value around 500 A short list including things to be avoided during installation is given below Power lines without an UPS system Power lines must not pass close to the system A layout of cables that creates a coupling between them Avoid putting other kinds of instruments in the same room such as a personal computer laser printer mediator etc Ground cables wrongly connected Bad central ground A method to understand how the noise level changes during the day is described so it will be possible to look at noise variations in real time Here are the operations useful for this check Put the homogeneous phantom inside the knee coil Inside the ARAS program select lt Test gt lt Manual gt lt RX Chain gt menu then lt Run gt set the lt FFT gt modality Set the Y axis to 1K It is thus possible to visualize the noise peak better In this modality two kinds of noise may occur Selective noise with a given frequency a single peak will be dis played at that frequency the higher the dB of the noise the higher the peak 47 8300096009 VER D System Procedures 48 large bandwidth noise white noise the whole level of the signal increases this means that the noise in the room is too high To improve the signal display click on the lt Average gt button and set a number around 20 When the previous operations are completed ver
39. to complete the patch installation then re boot the system Proceed with the OPI SW Release installation The procedure goes ahead automatically and will take more or less 30 Don t interact with the system and wait for the window shown in the next figure e When the next window appears click on the FINISH button to re boot the system SW Installation Switch on the System and perform the log on like user ADMIN ISTRATOR no password required Insert the ESAOTE CD if already present open the CD ROM drive and close it back to start the autoplay function The following HTML page will be automatically displayed Fig 43 Selection page ESAOTE THE IMAGE OF INNOVATION Select the E MRI Scan 8 1A Installation and the system will ask you to insert the activation code Fig 44 Selection page code request ESAOTE THE IMAGE OF INNOVATION Write 1611 and confirm it pressing the OK button to start the OPI installation When the next window appears click on the NEXT button 71 8300096009 VER D Software Repair 72 Fig 45 8 1 installation step1 5 Esaote S p A E MRI Scan InstallShield Wizard step 1 ESAOTE THE IMAGE OF INNOVvATION Welcome to the InstallShield Wizard for Esaote S p A E MRI Scan Release 8 1A Use eid Wizard will install Esaote S p A E MRI Scan on your computer To continue Next WARN
40. y grid will be expressed in Volts The following figure shows the RF pulse using Dec Div 1V and Res Div 2 0 The window information shows the values in Volts of the transmitted channel A and of the reflected power channel B 91 8300096009 VER C RF Subsystem Procedure 92 Receiving chain driving A description of the process and which modules are responsible for the receiving process is shown in the following figure Fig 56 Receiving channel description CPU The RF signal picked up by the reception linear coil BRX is sent through the cables from the RFR connectors RFR5 and to the magnet panel connectors respectively MRF and MRF1 Within RFR the RF signal is amplified and demodulated in quadrature removing the local oscillator signal central frequency of magnet Two 90 out of phase LF signals with a 50 kHz band are generated The frequency digital synthesizer SINT module SINT5 connec tor sends the local oscillator FRX to RFR inside the RFR4 con nector You can check the SINT5 s amplitude 1 2 Vpp frequency fO of the magnet and shape sinusoidal by connecting it to an oscilloscope The two LF signals going out of RFR through the RFR2 connec tor reach ACQ inside the PC unit ACQ converts the signals into digital signals and sends them through the HSSL1 cable to DSP inside the PC unit You can test the RF signal on RFR5
41. 26041 frequency 7894270 average ft 395 7 9366 9 position 1 threshold 1582 9 7894270 amplitude 9366 9 Execute DlGetFile FileName TMP_REC_FILE Execute DlGetFile FileName c nmr bin tmp tmp rec 40 Stop 0 ASEnd In the bottom part of the window look for the Aver age_fft value if it s to lower than 400 means that the system has a good signal to noise ratio and is good shielded 53 8300096009 VER D System Procedures In the event of noise of signal spikes exceeding the threshold threshold_f the program indicates their position co ordinate range 1 to 256 amplitude and frequency Please note that a continuous signal corresponds to co ordinate 1 This is the so called offset that is always present Therefore this spike must not be considered for the purpose of evaluating the situation In the event of persistent interference on site measurements must be taken exactly like those taken before installation In addition you must check that noise is not generated by the electronics You must also make sure that any type of lines or spots does not damage the images For this reason some test scans must be taken Conversely if the noise level exceeds the threshold it is likely that the receiving chain is malfunctioning or not properly calibrated Please note that the cause of this might be white noise picked up directly by the c
42. 4 RIS Rifl4 LNA 2inf Rifl 3 Rifi 2 i 1 1 1 e Connect the RIFL1 to SINT5 RIFL3 to RFR4 RIFL5 to RFR5 and RIFL4 to RFR6 like shown in the next figure e Disconnect the BNC connects to LNA2 inf and connect it to an extension cable but don t connect the extension to the RIFL2 till now 101 8300096009 VER D RF Subsystem Repair 102 From the ARAS program select lt Test gt lt Hardware gt lt RX Coil gt lt Run gt Wait for the system diascope like shown in the next figure Only when the diascope appears the system has set the RFR gains 1 and 2 to 255 maximum value Fig 66 RX Coil diascope Now connect the extension cable to RIFL2 and check the peak position and deep Fig 67 RX Coil peak seg ae ep o C j SE e In the center of the screen the Magnet central frequency is automatically set move the Varicap value and check if it s possible to set the coil peak to the magnet central frequency if no refer to the Tuning part check the deep peak it has to be at least 20dB when the peak is set to the Magnet central frequency if no refer to the Matching part Tuning amp Matching Remove the Coil and open the Coil base to have access to the circuit Change the central capacitors to tune the coil change the lateral capacitors
43. 60 nev freq 7693690 zero crossings 1 selected frequency 7893890 Sampling rate 19531 max signal 32767 frequency 7894270 zero crossings 11 Step Hz 380 new freq 7893890 zero crossings 2 selected frequency 7893890 Sampling rate 19531 max signal 32767 frequency 7894270 zero crossings 11 Step Hz 380 nev freq 7893890 zero crossings 2 selected frequency 7893890 annn a rec Day 101_05_16 freq rec Microsoft Internet Explorer Like for the 180 rec the frequency calibration is automatically done by the system every scout ac quisition to find the magnet frequency in that mo ment A small frequency shift is normal and compen sated by the system A frequency shift is related to a thermal shift usually due to the environmental thermal shift During the day the temperature of the room in crease and the CTERM has to follow this shift de creasing the power sent to the Magnet to warm up it In case of big Magnet thermal shift perform the System Monitor to follow in real time the tem perature and provided power to every channel Remember that the system is calibrated to the Magnet central frequency and it must be stable all the specification written in the Planning Guide and related to the installation room must be met Stable frequency means good image quality Fig 10 Varicap rec The Varicap is a voltage value 0 9V sent by the RFR to the Coil in order to set it to the Magnet
44. Coil to Magnet frequency save the lt Test gt lt Automatic gt lt Varicap gt lt 180 pulse gt new varicap and 180 pulse value manually GANTRY Go to lt Test gt lt Hardware gt lt System check gt and check to lt Test gt lt Hardware gt lt TX coil gt and set direct and reflect pulses are present the gantry tuning and matching to the system frequency Part8 Patient Handling Trouble shooting strategy In this chapter you will find test strategies encompassing Patient Handling Refer to the Functional Description manual Patient Handling chap ter for more information Procedure Check all the possible positions of the patient seat Check the patient seat stability Use the following scheme in case of adjustment or repair 8300096009 VER D 105 Patient Handling Trouble shooting strategy Part9 Gradient Trouble shootin g strateg y Fig 70 Transmission chain description gradient driving In this section you will find test strategies procedures and repair instructions encompassing the complete gradient system For more information refer to the Functional Description manual Gradient chapter Procedure Gradient driving transmitting chain A description of the process and which modules are responsible for the transmission process is shown in the following figure 107 8300096009 VER D Gradient Trouble shooting strategy 108
45. Disconnect RFR3 cable from the RFR module use the nine pin flat cable to connect RFR3 connector to RF3 cable and P1 con nector on the AINT box next figure Put the BNC cable between SINT2 on SINTO2 module and GATE IN AINT box e Insert the Pick up coil support into the Gantry and lock it like a normal coil e Connect the Pick up coil to the to the COIL IN connector AINT box e Putthe AINT box switch on DC mode and set its counter to 000 NOTICE No other counter settings are allowed e Disconnect the RFR2 cable from the RFR2 connector on the RFR module and connect it to the J1 connector on the AINT box using the 9 pin flat cable e Switch on the system 8300096009 VER D 109 Gradient Repair Fig 72 Cable connection the thinner cables the kit cables SSS p a Gp Go Gp 09 26 09 0 VD Gi c Go ap mp G VO Go 05 09 qa o e e eo wg Normal System connection SINT Control Unit TX E 3 SGRA calibration connection J1 P1 PickUp coil AINT box T pc T Fig 73 Pick up coil support 110 74 As you can see every channel X Y and Z have the same trimmers in the same positions From the top the first six trimmers are dedicated to the gradient output waveform adjustment the tri
46. ESAOTE THE MAGE OF INNOVATION Checa ARTOSCAN C DEDICATED MR MR Service Manual Service Manual O ESAOTE S p A AG2004 The reproduction transmission or use of this document or its rights created by patent grant or registration of a utility model or design are reserved Replaces 8300096009 VER C English Doc Gen Apr 2004 8300096009 VER D Document revision level The document corresponds to the version revision level effective at the time of system delivery Revisions to hardcopy documentation are not automatically distributed Please contact your local ESAOTE office to order current revision levels Disclaimer The installation and service of equipment described herein is to be performed by qualified personnel who are employed by ESAOTE or one of its affiliates or who are otherwise authorized by ESAOTE or one of its affiliates to provide such services Assemblers and other persons who are not employed by or otherwise directly affiliated with or authorized by ESAOTE or one of its affiliates are directed to contact one of the local offices of ESAOTE or one of its affiliates before attempting installation or service procedures Part0 Table of Contents Part1 Introduction 7 Repairs 12 General conditions for repair 12 Procedure for returning goods to ESAOTE 12 Warranty
47. From OPI perform a Scout scan and set the anatomical area as other then check its position Fig 91 Correct vial position e Click on Protocol list then select the lt Shimming Test 2 2 Cos sequence 131 8300096009 VER D Magnet Procedure 10 132 Shimming Parameter Calculations Fig 93 Select the shimming images Image Selection To load the correct image from ARAS select the lt Open Service Img File gt icon as shown Fig 92 Open the service image files Scan Management GOL Noa service img Flo Select the Remote option then Shimming from the shown list and the system will show you only the shimming images Select the image corresponding to the shimming parameter has to be calculated 2 0 Identify the co ordinates of three points the vial s partition one at the center and two at a distance of 70 pixels vertically A B and C To do that move the mouse prompt on the image and on system will show the coordinates on the left bottom corner or type the right mouse button when the mouse prompt is on the selected images and the drop down menu will appear then select the Distance option A is at the center of the partition and its co ordinates are A 128 B is above at a distance of 70 pixels vertically and few pix els offset horizontally depending on the in homogeneity Its co ord
48. ING This program is protected by copyright law and international treaties Fig 46 8 1A installation step2 8 Esaote S p A E MRI Scan InstallShield Wizard step 1 License Agreement Please read the following license agreement carefully USAGE LICENSE AGREEMENT FOR THE SOFTWARE INCLUDED INTHE APPARATUS Attention Please read with care the terms and conditions indicated below before using the software on the unit Use of the software implies acceptance of the terms and conditions listed below PROPRIETARY RIGHTS You have acquired a device DEVICE which includes Esaote S p A proprietary software and or software licensed by Esaote S p A from one or gt f l innnan rc nb lt mnnn mem Cal mA accept the terms in the license agreement 1 do not accept the terms in the license agreement Installshield lt Back Cancel When the next window appears click on the sentence I accept the terms in then click on the NEXT button When the next window appears insert the system own data the generic data as shown in the next figure remember that the system serial number must not start with 0 zero select the cor rect system you are installing then click on the CONTINUE but ton Fig 47 8 1A installation step3 Fig 48 8 1A installation step4 5 Esaote S p A E MRI Scan InstallShie
49. LATO PAZIENTE FRONT HIGH RIGHT VIEW FROM PATIENT SIDE The silver coins placed laterally on the shimming plate are always positive but positive is a relative concept related to that shimming plate Remember that positive is a relative concept what is positive on the right shim ming plate is negative on the left shimming plate and vice versa Test on the right coins what has to be placed on the right shimming plate and do the same on the left shimming plate Stack the neodymium pieces only if the software solution told you that Remove the Gantry and insert the shimming plates the four piv ots present on both the iron poles must fit the four holes present on both the shimming plates Insert the plates carefully because the attraction between them and the magnet is very strong Insert the Gantry and reconnect all the cables then place the metallic cover Enable the GRA module re connecting the ENABLE cable Calibrate the Homogeneity test and the SE and GE sequences Repeat the shimming parameters procedure from the beginning If the parameters are now correct fix the neodymium pieces with glue using this procedure to have access to the shimming plates If the parameters are not correct remove the shimming plates and check the polarities dimensions and positions of the shimming pieces placed to corre
50. ORMER GROUND FROM RIB UNIT TO DSP BOARD FROM RFA OUT TO TX COIL TO CTERM FROM GRA FROM TO TRANSFORMER FROM CTERM FAST HEATERS dn 7679 This picture shows the Magnet Panel Connector connec tions to the others system modules Procedure From the ARAS program select lt Test gt lt Hardware gt lt Sys tem Check gt lt Run gt Click on channel and from the drop down menu select the Varicap channels and try to move the Varicap 1 changing its value If the Varicap are not present or is not possible to move the Varicap 1 the RFR module is broken Fig 59 Gains 1 and 2 7X asa DDD as x sera gt vit re e a SINT check Procedure From the ARAS program select lt Test gt lt Hardware gt lt Sys tem Check gt lt Run gt Click on channel and select the 7 channel as shown in the next figure If the direct and reflected pulses are not present the SINT module does not enable the RFA module and is probably bro ken Or Open the front console covers Disconnect the SINT5 BNC and connect the oscilloscope probe to the SINT5 plug Check if the output is a sinusoidal wave of the same frequency as the magnet 1 2Vpp If it is not this means that the SINT module is broken 95 8300096009 VER D RF Subsystem
51. RO setup window Network Settings select Typical Settings then press NEXT In the fifth WIN2000PRO setup window Workgroup Or Com puter Domain select No this computer is not on a net Work then press NEXT In the sixth WIN2000PRO setup window Completing the WIN2000 Setup Wizard press FINISH Remove the SW CD during the automatic re boot In the first Network Identification Wizard window press NEXT In the second Network Identification Wizard window select User must enter a user name then press NEXT In the third Network Identification Wizard window press FINISH Perform the log on like Administrator user NO PASSWORD NEEDED Uncheck the box Show this screen at startup and press EXIT to close the window From the desktop select START SETTINGS CONTROL PANEL gt and the DISPLAY icon In the Display window se lect lt SETTINGS gt Inside the SETTING window MONITOR tab set True Color and 1280 1024 screen resolution then press the Advanced button and set the refresh frequency to 75Hz save and quit pressing OK in all the opened windows From the CONTROL PANEL gt window select the lt ADMINIS TRATIVE TOOLS icon then in the opened window select lt Lo cal Security Policy Local Policies User Right Assign ments Change The System time gt Add lt Users gt lt Add gt Ol then close it Insert the WIN2000PRO CD and close the automatically opened window
52. Sample Div 16 4 Disp 0 258 Center Scale Trace A ev Level Disp 400 2800 4 Center Scale r Trace B ey Level 4 Disp 290017 2 Center Scale focal c 9 To change the spin orienta tion we have to send power to the phantom or patient The RFA takes care to am plifier the signal received from the SINT module and sent it to the Gantry trans mission circuit The blue trace is the direct pulse the energy that the RFA is transmitting to the Gantry The red trace is the energy that we are losing because the Gantry is not equal to the ideal load 500 It must be lower than 20 of the di rect pulse If the red trace is flat means that the SINT module is bro ken or the cable between SINT and RFA If the blue trace is flat dis connect the output cable and connect a dummy plug 500 to the RFA output if the trace is still flat means that the RFA is broken oth erwise the Gantry or the ca ble are broken 8300096009 VER D 43 System Procedures Image quality Common interference problem analysis The most frequent cases are the presence of artifacts on the image generated by external radio frequencies interference created by some electronic modules inside the electronic unit or spikes A typical case of the radio frequency problem generates a strip on the image this can be more or
53. The control software operating on DSP sends the digital commands necessary for driving the transmission coil to the CNTR The CNTR is in the Control Box while the DSP is in the PC box These commands are processed multiplexed and synchronized inside the CNTR and sent to SINT inside SINT3 connector SINT processes the commands received by CNTR digitally and sends on SINT1 the driving RF signal to RFA in connector RF Inside SINT PCB SINT2 connector the GATE signal is also avail able to enable the GRFA This signal is a TTL type high active sig nal RFA enable RFA amplifies the RF signal impulse and sends it through RFOUT connector to the RFAOUT of the filter panel connected to the MBTX connector of the magnet panel BTX flexible pressed matter circuit fixed inside GANTRY On RFA there is another connector called CONTROL connected RFD cable to the ACQ module Inside the CONTROL connector there are the reference signals from reflected and direct RF power GATE signal and ALARM RFA signal Use of System Check You can display reflected and direct RF power using lt System Check gt and examine the envelope of the RF pulse as measured at the RF amplifier output RFA module by a reflectometer It gives a voltage proportional to the square root of the transmitted power blue track or channel A another voltage proportional to the square root of the reflected power red track or channel B their ratio Pd Pr is clo
54. at least two per time to reach the correct peak match Refer to the following figure for the capacitor positions Fig 68 Coil 1 2 and 3 Circuits 571 00 PA NS v 1 To adjust the coil tuning change the capacitors 15 and or C17 in black in the figure increase them means decrease the coil frequency tuning To adjust the matching act on the variable capacitors CV2 and CV3 of the same amount They reach the maximum and the minimum values in one turn If the variable capacitors are not enough set them to the middle values and then change the ca pacitors C14 C16 C18 and C19 in gray in the figure but re member the total value C14 C16 must be equal to the total value C18 C19 8300096009 VER D 103 RF Subsystem Repair 104 Tab 8 Test and adjustment MODULE TEST ADJUSTMENT Try to acquire some images Phase and Quadrature Channels inside lt Test gt lt Manual gt lt RX chain gt and the Gain Channel inside lt Test gt lt Manual gt lt Gain Channel gt Carry out automatically 180 pulse inside lt Test gt lt Auto Save for every coil lt Test gt lt Automatic gt lt 180 matic gt lt 180 pulse gt Check TX coils pulse gt manually calibrate the Transmission coil lt Test gt lt Hard ware gt lt TX coil gt Carry out automatically varicap and 180 pulse inside Tune the
55. aulty component We are aware that the first versions of this manual do not provide the reader with an entire spectrum of information The manual will be updated accordingly in the future Any feedback is strongly en couraged and will be warmly welcomed to provide you with the tools you need We need your help Distribution The goal is to distribute the Online documentation as well as the paper version to the MR via a distribution list This means that in the future this documentation will no longer be delivered with the system Service Manual structure The troubleshooting guide is structured as shown below Table of Contents e Introduction Safety e System e Software e Host e Control e RF system e Patient handling e Gradient system e Magnet e Power distribution power e Maintenance instructions e Changes e Suggestions for use The information for the different system components has been sub divided into Test Strategy Test Procedures Diagrams Repair and Adjustment Procedures Strategy The flowchart is designed as a general guideline for selecting the appropriate trouble shooting procedures The objective of the accompanying descriptions is not to give de tailed step by step instructions into the finer art of trouble shooting but to offer a means of guiding you given a particular problem to the right test procedure briefly and simply If more detailed instru
56. be able to see straight lines that either do not change in time or change very slowly The System monitor test visualizes a flat line if the temperature error is higher then 0 7 C depending of the CTERM offset with respect to the ideal value As for the numerical values the temperature error must have an absolute value smaller than a few m C and the power out put to the heaters always positive must be lower than 20 Watts for every channel Fig 85 System Monitor Test os C eg AR noe Rc an en fa inn L1 2 Sensors Heaters Check It is possible to measure the resistance values of the Sensors and Heaters present into the magnet doing that you can understand if one channel is correct or if is a open or shirt circuit Disconnect the CTEMA cable from the CTERM module connector and measure the resistance between pins of the cable connector against the specification written in the following table Tab 9 Heaters and sensors values TYPE MINIMUM MAXIMUM VALUE VALUE 1 s 10 22 Sensor up 19KQ 27KQ 11 22 Sensor right 18KQ 24KQ 12 22 Sensor down 19 27 13 22 Sensor left 18ko Consider the reference values for the sensors above reported indicative when the magnet is cold To do a data evaluation when the magnet is warm it is necessary to know that th
57. ble shooting strategy 105 Procedure Part 9 Gradient 105 107 8300096009 VER D Table of Contents Trouble shooting strategy 107 Procedure 107 Gradient driving transmitting chain 107 Use of the System Check 108 Repair 109 GRA replacement essen 109 GRA gradient 10 Necessary 0 5 0 109 Gables 109 Check the 5 112 Gain gradient calibration Geometrical distortion test 117 Introduction 117 Necessary 2 4 1 117 Operations M 117 Test and adjustment table 120 Part 10 Magnet 121 Trouble Shooting Strategy 121 Procedure 122 Thermal Control Check 122 Sensors and Heaters Check 123 Shimming 128 Necessary 0 128 Shimming Parameter Acquisitions 130 Shimming Parameter Calculations 132 Access to the shimming 137 Shimming parameters correction 137 Test and adjustm
58. blems after installation Therefore to reduce the noise level in the room you must ascertain in advance which are the possible causes of the problems by ac quiring images in different conditions For example this can be done by turning off all possible sources of problems step by step then checking the average fft value by clicking on the lt Shielding gt in the lt Automatic gt service menu If the problem has not been identified yet proceed by making sure that all power lines use a line filter that there are no other critical instruments in the system room and that every ground cable of the machine is properly connected With regard to these problems we recommend putting the power line through an UPS system so that the power line that arrives at the system or at other instruments is without noise without selec tive interference or noise with a large bandwidth Another critical factor for the noise level is the presence of personal computers or other instruments that could create some interference by increasing the noise level This noise could be selective interfer ence lines on the images or more likely white noise noisy im ages However in any case the image quality decreases signifi cantly Both the machine ground and the central ground must also be checked because they sometimes generate problems As a matter of fact it has often been noted that if the grounding problem is solved the average fft level decreases
59. bra tion aren t in a wished form there is something not OK check the files 20004 W varicap calibration the amplitude of the signal during calibration isn t in a wished form there is something not OK and check the rec files 20005W frequency step calibration we can t obtain the number of intersections wished with zero check the rec files 20006W 180 calibration the amplitude of the signal during calibra tion isn t in a wished form there is something not OK and check the rec files 20007 W 90 180 calibration the amplitude of the signal during cali bration isn t in a wished form there is something not OK and check the rec files 20008W frequency calibration during scout we cannot obtain the number of intersections wished with zero check the rec files 20009W gains sweep calibration the max value of the signal after calibration is not in the wished range there is something not OK 20010W 90 pulse calibration anomaly insulating belt is recom mended Do you want to proceed Anomalous signal 20500 W temperature not in range Signal out of range 22000N signal not in range Off line calibration codes 23000N Correct temperature the temperatures are in the wished range 23001 Incorrect temperature one or more temperatures aren t in the wished range 23050N Correct field the frequency is in the expected range 23051 N Incorrect field the frequency isn t in the e
60. button Use the arrow to set the logical channel 4 to display the external temperature Press lt Scale Div gt to set the correct value for the scale on the Y axis usually 1 C or 5 C Then with the mouse cursor click on the signal trace to obtain some information about it in the information window 8300096009 VER D Magnet Procedure 127 128 Shimming Check Good homogeneity of the static field of the magnet is a necessary condition if you want to obtain good quality images The shimming procedure carried out in the factory guarantees that magnetic field homogeneity is within specification when the magnet comes out from the factory However due to several factors transportation storage etc the magnetic field may change and the service operator might find that on site the homogeneity is not within specification anymore this is due to the fact that some field coefficients notably the second order coefficients have increased The aim of this procedure is to detect and if necessary correct on site the second order coefficients of the magnetic field The flow chart shown below illustrates the logical sequence of the steps to be performed to check and whenever necessary to cor rect the static magnetic field and in particular the above mentioned parameters The chronological order of these steps is very important because the various parameters affect each other so that correcting one of
61. c tions are necessary then the CSE will be referred to the appropri ate procedures in the section Test Procedures Procedures Here the CSE will find detailed test instructions You will also find descriptions for standard procedures for example starting the SeSo connecting the laptop to the Host reading log files etc This section also contains descriptions for interpreting the test results Furthermore you will find general information pertaining to parts location fuse ratings power supply information measuring points descriptions of LEDs and potentiometers in this section Repair If a module needs to be replaced procedures for its replacement and subsequent necessary adjustments are described in this sec tion Index An index at the end of the book provides you in addition to the ta ble of contents with cross references to inform you about topics that you may wish to look into for further information It is a helpful source of information when looking for related topics when you want to concentrate on items of interest For example if you would like to know more about the adjust frequency you could either look under for adjust or F for frequency Many topic listings are redun dant to help make your search more successful 8300096009 VER D General Page intentionally left blank 10 2 Service Policy Product Line Support Center All communications with th
62. ct the wrong parameters If everything is correct proceed with another correction using this procedure 141 8300096009 VER D Magnet Procedure 142 Test and adjustment table MODULE TEST ADJUSTMENT CTERM MAGNET SHIMMING Check if the new module is working automatically monitor Read on the CTERM label the new offsets and ing the power inside lt Test gt lt Automatic gt lt Temperature gt insert them into the Internet Explorer After several hours check the temperature in the same way Repeat all the tests as during the installation Or check the power and the temperature inside lt Test gt lt Hardware gt lt System Monitor gt Perform the Homogeneity and gradient offset check Calibrate the system and fill in the Quality Form Part 11 Power Distribution Introduction Strategy In this section you will find the strategies for trouble shooting on the This chapter describes the test strategy for the Power Distribution power distribution CAUTION Voltage continues to be present at the line voltage transformer even after the MR system has been switched off The line power Dis tributor must be switched off for service work and the on site circuit breakers must be set to OFF The green Power Light is located on the left side of the console If it goes off there is a problem in the main line or the light bulb 143 8300096009 VER D Power Distribution Introduction 11 144
63. ctions In this chapter you will find repair instructions encompassing the complete host system Mother Board Bios Switch on the system and press the delete key during the boot to enter in the CPU board bios set up Standard CMOS set up Date mn date year XX Xxxx Time hour min sec HARD DISKS TYPE SIZE CYLS HEAD PRECOMP LANDZ SECTOR MODE LBA LBA Primary Master Auto 0 fo Primary Slave None o jo Secondary Master A o Jo jP Secondary Slave o o o fo fo o O C ge C 5 C s Drive Floppy 3Mode Support Disabled Video EGA VGA Halt On All but keyboard 80 Bios features set up po Video ROM BIOS Shadow Enabled Delay Msec 250 IDEHOD Dsabed _ HOD SMART Ema _ Function Conver ae _ osa 8300096009 VER D Repair instructions 81 Chipset features set up DRAM are 64 not 72 bits wide O 5 82 Power management set up HDD Power Down Disabled Thermal Monitor a 7 Powerupcontrol __ 0 wee ________ 8300096009 VER D Repair instructions 83 84 PNP and PCI set up hse Yes Auto
64. cus images called blurring effect may be caused by Thermal instability of the system Fluctuation of the signal due to DC magnetic interference Fluctuation of the signal due to miscellaneous HW problems Fig 25 Blurring artifact probably due to external DC Consider that strong spikes in the power line may cause some problems such as the moire artifact Fig 26 Moire artifact probably due to strong spikes on the power line If the operator detects the above mentioned artifacts in the images he she must first analyze them carefully A list of scans can be found in the OPI program Protocol List folder The Service operator may use them to check the image quality hence to identify any of the above mentioned problems All the current scans are to be taken in multi slice mode with the slices oriented as desired Have at least one standard direction and one double oblique slice for each scan and change the directions between scans Please note that since before each scan an automatic fine calibra tion of resonance frequency and of the receiving chain gain is per formed any problems should be detected through the calibration procedures and suitably signaled It may be advisable however to check the results produced by calibration in the store files freq rec and autotar rec 51 8300096009 VER D System Procedures 52 Shielding efficiency The p
65. d COI 26000N timeout on COI incorrect scan duration Alarm test codes 26500N No alarms found 26501 N gradient amplifier not powered 26502N gradient failure 26503N gradient amplifier not powered gradient failure 26504N cterm failure 26505N cterm failure gradient amplifier not powered 26506N cterm failure gradient failure 26507 cterm failure gradient amplifier not powered and gradient failure 26508N RF amplifier failure 26509N RF amplifier failure gradient amplifier not powered 26510N RF amplifier failure gradient failure 26511N RF amplifier failure gradient amplifier not powered and gradient fail 26512N RF amplifier failure cterm failure 26513N RF amplifier failure cterm failure and gradient amplifier not powered 26514N RF amplifier failure cterm failure and gradient failure 26515N RF amplifier failure cterm warning gradient amplifier not powered and gradient failure 26516N RF amplifier not powered 26517N RF amplifier not powered gradient amplifier not powered 26518N RF amplifier not powered gradient failure 26519N RF amplifier not powered gradient failure and gradient amplifier not powered 26520N RF amplifier not powered cterm failure 26521N RF amplifier not powered cterm failure and gradient am plifier not powered 26522N RF amplifier not powered cterm failure and gradient fail ure 26523N RF amplifier not powered cterm failure gradient fail
66. d gradient amplifier not powered 1930 E RF amplifier failure RF amplifier not powered cterm fail ure and gradient failure 1931 E RF amplifier failure gradient amplifier not powered cterm failure gradient failure and RF amplifier not powered Timeout between OPI and 2065 E error during initialization 2066 E error during scan Autofov 2166 E system call error 2172 E configuration file error Automatic selection codes of calibrations 2266 E system call error 2272 E configuration file error 8300096009 VER D 25 System Strategy 26 Calibration of magnetic compensation 2466 E system call error 2472 E configuration file error Frequency calibration during scout 2666 E system call error 2672 E configuration file error 90 180 calibration 2766 E system call error 2772 E configuration file error Alarm codes 2866 E system call error 2872 E configuration file error Gain RF sweep codes 2966 E system call error 2972 E configuration file error Temperature measurement codes during scout 3066 E system call error 3072 E configuration file error Noise and temperature calibration 3466 E system call error 3472 E configuration file error Frequency calibration 3566 E system call error 3572 E configuration file error Frequency phase measurement calibration 3966 E system call error 3972 E configuration fil
67. e e f the internal field is displayed larger or in the opposite phase with respect to the external field trace you are overcompensat ing rotate the trimmer in the opposite direction and try again When the specification is met fix the probe to the wall using the suitable screws AC Compensation It is possible to compensate only one AC source 50 or 60 Hz NOTICE Perform the DC Compensation if necessary before the AC Compensation If it is not neces sary to compensate for the DC noise connect the DC dummy plug contained in the Magnetic Compensation Kit to the PROBE DC connector of the CTERM module NOTICE The probe must be fixed on the wall at the end of the magnetic compensation procedure use tape to fix it during compensation Hardware Connection Remove the electronic left side cover patient side Disconnect the cable connected to the Control6 connector of the Control Unit module then disconnect the cable connected to the RFR3 connector of the RFR module and connect it to the P1 connector of the AINT box use the extension cable provided with the kit if necessary Disconnect the cable connected to the Control5 connector of the Control Unit module Connect the reset cable code 8830505000 to the connector J1 of the AINT box to Control6 of the Control Unit box and to 2 of the CTERM module trough the cable already pres ent and put the AINT box switch to AC and set the AINT box
68. e center must be in English at these ad dresses The Support Center provides all general activities targeted to cus Esaote S p A tomer support manuals training Service Information etc Via Siffredi 58 Specific Service activities and responsibilities include 16153 Genoa Italy Fax 39106547275 E mail MRI Service Esaote Com Service Manuals Service Information Service Training Sales and Service administration Product Part Lists The entire Service Administration is managed through your Sales Part repairing process Area Manager Responsibilities include On line support mail phone fax etc Spare Parts Price List The support center are currently open from 8 00 a m to 5 00 p m Order Processing local time between Monday to Friday excluding Public Holidays and ESAOTE summer closing period Repair Administration invoices and shipments 11 8300096009 VER D Service Policy Product Line Support Center 12 5 Orders shall be issued to the Export Sales Department according to ESAOTE general rules and your Spare Parts Price List Part Numbers are required for prompt order process items not in cluded in Spare Part Price List cannot be ordered to ESAOTE All orders are subject to ESAOTE approval and orders below half million of Italian Lire are not accepted Delivery terms on spare parts range between 60 90 days Repairs General conditions for repair
69. e error Gradient Offset calibration codes 4066 E system call error 4072 E configuration file error RX Offset calibration 4166 E system call error 4172 E configuration file error Signal missing in calibration 18000 W 18001 W 18002W 18003 W 18004W 18005W 18007W 18008W 18009W frequency calibration there is no signal gain calibration there is no signal encoding calibration there is no signal 90 calibration there is no signal varicap calibration there is no signal frequency step calibration there is no signal 90 180 calibration there is no signal frequency calibration during scout there is no signal gain sweep calibration there is no signal Noise level codes 19000W media noise calculated from FFT signal is over threshold 19001 W there are spikes in the signal 19002W media noise over threshold and spikes in the signal Bad signal codes 20000W frequency calibration the shape of the signal during cali bration isn t in a wished form there is something not OK check the files 20001 W gain calibration the amplitude of the signal during cali bration isn t in a wished form there is something not OK and check the rec files 20002W encoding calibration the amplitude of the signal during calibration isn t in a wished form there is something not OK and check the rec files 20003W 90 calibration the amplitude of the signal during cali
70. e metallic cover and check for functionality of the cover fan Close the plastic detergent residuals to evaporate then mount the coil in place and check functionality Check the wheel and brake functionality if nec essary lubricate the wheel bearings every six months every six months 151 8300096009 VER D Maintenance Instructions Maintenance Plan 152 DESCRIPTION TOOLS amp FORMS PROCEDURE FREQUENCY DONE N A OK NOK Check for integrity For the number of cushions required refer to the every six and number of relevant chapter in the User Manual months cushions RX coils tuning Quality Form check Check of the follow Screwdrivers Phil Remove the Electronic Unit and Magnet Unit cov every six ing ground screws ips tips standard ers to gain access to the cables and connectors months cables connector tips Allen keys or after checking and screwing all the covers until caps both of the adjustable span they are closed Magnet and of the ners Electronic units Check of the safety Inspect the labels on the Magnet and on the Site every six DERRE door to make sure legible parame Shimming kit mM and eventually correct the Magnet shim every year DS parameters Protective Check the insulation every year Measurements Page 3 of 3 13 Index CMONS SeLUD usos mage rte 80
71. e the shown data against the date shown in the following figure Fig 51 IE homepage Software Version Release 8 1 E MRI Scan 26 02 2004 Build 5 0 2195 Update Service Pack 4 Activate the system options opening the IE Options page Fig 52 IE Options page 224 Oen Host 10 Image Enhancement Disabled Cinematic Acquisition Disabled ftbi Terrane Analysis Disabled Dicom Functionality Enabled Sew License Code Activation Key Set the Hardware Configuration page in according with your system component status The procedure is finished proceed with the System restore or data inserting and or calibrations 8300096009 VER D 75 Software Repair Configuration restore Log on the system like SERV typing the correct password and launch Internet Explorer Insert the back up optical cartridge created during the Back up procedure into the ODD 3 v2 From the homepage select Configuration Management and Backup amp Restore like shown in the next figure Follow the SW indications Fig 53 Configuration Restore Q Remember to save the system configuration to an Esaote Service Configuration Archive with the Backup function whenever a Service Maintenance is performed o Anytime you can retrieve from a compliant Esaote Service Configuration Archive the system configuration settings with the Restore funct
72. e value of sen sors at 36 C is 13 8 and that a variation of about 5000hms corresponds to 1 C opposite in sign with respect to temperature 8300096009 VER D 123 Magnet Procedure Fig 86 Magnet Heater positions 124 FAST HEATER MAGNETIC COMP COIL TERMO UP HEATER LEFT HEATER COMP COIL NOTE HEATER CONDUCTOR JUNCTION Ti THE HEATER TO TERMOSWITCH HAEATER CONNECTOR TO THE NTC BOARD PIN OUT CONFIGURATION DOWN HEATER FAST HEATER FAST HEATER TERMO SWITCH Fig 87 Magnet Sensor positions GANTRY CAVITY NOT PATIENT SIDE NOTE SENSOR CABLE JUNCTIONS HEATSHRINK COAX CABLE 6174 500HM SENSOR CONNECTOR PIN OUT CONFIGURATION 8300096009 VER D 125 Magnet Procedure 126 check the cable use the following figure Fig 88 CTEMA Cable pin out C TEMA CABLE CONNECTORS INTERNAL VIEW RED WHITE SENSOR GROUND Operations From the ARAS program select lt Test gt lt Hardware gt and lt Sys tem Monitor gt then lt Run gt Use the arrow to set the logical channels 0 1 2 3 to display the parameters on the four sides of the magnet Click on the lt Channel A gt icon to display only the temperature error or
73. ed from DSP initialization code 808 E COI configuration error 810 E timeout error waiting for DSP initialization code completion Frequency calibration time 902 E system call error 908 E configuration file error Gain calibration time 1002 E system call error 1008 E configuration file error Calibration of the codification 1102 E system call error 1108 E configuration file error 90 calibration 1202 E system call error 1208 E configuration file error Varicap calibration 1302 E system call error 1308 E configuration file error Step frequency calibration 1402 E system call error 1408 E configuration file error Noise level calibration 1502 E system call error 1508 E configuration file error Temperature measurement 1602 E system call error 1608 E configuration file error 180 calibration 1702 E system call error 1708 E configuration file error Noise measurements 1802 E system call error 1808 E configuration file error Alarm codes 1901 E gradient amplifier not powered 1902 E gradient failure 1903 E gradient failure gradient amplifier not powered 1904 E cterm failure 1905 E cterm failure gradient amplifier not powered 1906 E cterm failure gradient failure 1907 cterm failure gradient amplifier not powered and gradient failure 1908 E RF amplifier failure 1909 E RF amplifier failure gradient amplifier not powered
74. en the corresponding test are performed e g the lt System Monitor gt test compiles the lt RecFile Plot System Monitor gt history file Fig 11 History File Selection System histor Environment temperature Central precession Larmor frequency of static magnetic field Noise average FFT Fig 12 lt RecFilePlot System History gt folder Local z Camel Remote 9 08 Rec File Plot System History Rec File Plot System Monitor File Plot Stress Look In Local C Remote alii File Plot System History 80 FREQUENCY 468 B j NOISE 432 B 2 ROOM TEMP 494 File Plot System Monitor File Plot Stress 37 8300096009 VER D System Procedures 38 System monitor Temp Power UP INNER DOWN OUTER DOWN INNER and UP OUTER Temperature power associated with each of the four heaters Environment temperature Magnetic field strength Magnetic field strength Magnetic field strength in the gantry The last logical channel is fundamental also as a tool while per forming magnetic compensation Fig 13 lt RecFilePlot System Monitor gt folder P clea Cancel Remote File Plot System Monitor amp Down 448 E LEFT 444 RIGHT 444 8 ROOM TEMP 444 E MAGNETIC FIELD 444 amp 301 Ree File Plot Stress m
75. ent table 142 Part 11 Power Distribution 143 Introduction 143 Strategy 143 Repair 145 Checking the line 145 Adapting transformer to the line voltage 145 Part 12 Maintenance Instructions 149 Maintenance Plan 149 Part 13 Index 153 Part 1 Introduction Overview Parallel to the advent of a whole new generation of MR systems a totally new service support philosophy is dawning matching and tailored to the modularity and efficiency of the latest hardware tech nologies incorporated into this advanced line of machines In keep ing with this progress of newer and enhanced designs it has be come not only feasible but necessary to adapt to a service strategy making failure isolation and repair as economical as possible In line with these trends we have attained a level of service friendli ness never before achieved This introduction to the TSG docu mentation is designed to give you an overview of this new trouble shooting concept for the system NOTICE Any installation assembly maintenance exten sions regulation modifications or repairs must be carried out by authorized personnel only General This register contains an introduction to the service manual what the service manual contains and how it can be best used It will also attempt to present how the service manual and FUN are coupled tog
76. ether and complement one another Here you will find a general explanation of the concept structure the various sections compris ing the service manual and how they can be used most effectively for trouble shooting and repair Information on the new page format and on line documentation are covered in the manual FUN part Prefix section Documentation Intro The contents of the service manual will support service technicians during on site trouble shooting and faulty component isolation While the instructions are not a substitute for an in depth knowledge of the system its components or the underlying physics they will facilitate on the one hand trouble shooting procedures for the less experienced technician and on the other support the more experi 7 8300096009 VER D Introduction Overview enced technician in performing essential measurements and tests The instructions will also explain standard procedures such as measurements of power supplies etc The service manual should not and does not take the place of an error catalogue In most cases hardware faults are easily and quickly located Intermittent errors require more time and patience It is not within the scope of the service manual to list all possible tests Its purpose is to support the search for frequently occurring errors to allow the technician to limit the error search to certain functional groups and to propose measurements for localizing a f
77. he pins at 60mm are Display the reconstructed image in format 1 Zoom in the image 59 4 mm 60 6 mm if necessary Select lt Distance gt icon and measure from the left pin to the right pin horizontally from edge to edge between the pins at 60 mm NOTICE In the event of gain adjustment repeat the Homogeneity and gradient offsets check 119 8300096009 VER D Gradient Repair 120 Test and adjustment table MODULE TEST ADJUSTMENT Gantry Select lt Test gt lt Hardware gt lt System check gt and see if the output signals from the GRA gradients are present Select lt Test gt lt Hardware gt lt System check gt and see if the output signals from the GRA gradients are present Check the gradient rise time and the geometri cal distortion test for every channel then cali brate the system homogeneity sequences etc Check the gradient rise time and the geometri cal distortion test for every channel then cali brate the system homogeneity sequences etc Part 10 Magnet Trouble Shooting Strategy You will find test strategies procedures and repair instructions en compassing the complete Magnet System in this section For more information refer to the Functional Description manual Magnet chapter WARNING Make sure you use only ferromagnetic tools near the magnet Do not place any other ferromagnetic objects near the magnet e g the me
78. he temperature and power values of the magnet The dimensions along the Y and X axes of the object are stored in this file Alarm messages are stored in this file diascope rec The file is the file to which Diascope writes every time it runs The file is the trace recording of the ac tivity of the executable ortho The file is the trace recording of the ac tivity of the executable res The file contains the results of the inquiry to the other system The file contains the data for the stability test The file contains the data of the shim ming calculation The file is the trace of the general activity of the machine 8 180 value 212 calculated ratio 12697 13891 value 214 calculated ratio 12669 13912 value 216 calculated ratio 12686 13647 value 218 calculated ratio 12664 13712 value 220 calculated ratio 12697 13464 value 222 calculated ratio 12658 13384 224 calculated ratio 12615 13057 value 226 calculated ratio 12475 13076 value 228 calculated ratio 12507 12994 value 230 calculated ratio 12486 12950 value 232 calculated ratio 12345 12727 value 234 calculated ratio 12320 12782 new value 236 calculated ratio 12191 12534 Calculated value 212 10940 10963 10757 10827 10604 10573 10350 10483 10389 10371 10309 10375 10281 Calibration class 5 leggi_classi NOTE class 5 2 not found
79. he user can continue to work the operator must decide whether he wants to continue button Yes or not button No After this he exits the message window Note error code message There may be a failure but the user can continue to work the operator must click the cancel button to exit the message window System call error With this string we refer to a generic system error related to an operation as opening reading writing file which fails This kind of error causes a NON RECOVERABLE situa tion that might need service intervention Configuration file error This string means that the data of the configuration file which we are trying to read are not in the expected for mat This kind of error causes a NON RECOVERABLE situation that usually need service intervention Abbreviation codes E error N note W warning Symbols used COI CPU control interface LIF lower control interface OPI operator interface DSP digital signal processing Predef files with all predefined scan data information Error messages list For every error code there is the type E W N and the description The error codes are subdivided in paragraphs according to the situation that can give rise to them Generic codes 1E input error from LIF command 9E general COI fatal error 10 E fatal timeout error from OPI after abort signal MIF command parsing time 101 E invalid MIF command 102 E system call
80. hes the GRA IN connector Gradients are sent to the magnet side through the filter panel to the magnet connection panel rear side Gradient X Y and Z coils are fixed into the GANTRY to the magnet and are made of multi layer rigid circuit matter 39 8300096009 VER D System Procedures 40 Fig 15 System Check X Y Z channels gradient ampl The first three channels of the System Check test are the gradient waveforms The blue traces are the output of the CNTR board and the in put of the GRA module The red traces are the output of the GRA module If the input traces are not present means that or the CNTR is broken or the cable between the CNTR and the GRA is broken If all the output traces are flat probably the GRA is broken or not powered or disabled by the CTERM module If only one of the output trace is flat swap the gradi ent cables e g X is flat in vert X with Y If the problem moves to an other channel means that the problem is from the GRA on cables or Gantry if the problem is still on the same channel means that the gra dient board is broken Fig 16 System Check Varicap 1 2 2 The Varicap is a voltage value o 9V that the RFR sends to the Coil in order to set it at the magnet central frequency taking care of the inserted
81. ify if the level of the signal is close to 1K first step of the vertical grid or if the May variable in the information window has a value of around 1350 that means that the noise level is good average fft less then 500 On the contrary if the level is higher then you can carry out two different trials Verify the noise level putting a Dummy cup in the suitable sup port supplied in the Gradient Tuning Kit Verify the noise level when a patient puts a limb inside the coil Regarding the first case you can reach this conclusion if the noise level is again in the specifications with the Dummy cup this means the problem could be external otherwise some parts of the elec tronic unit would create a rise in the noise level Check each mod ule and cable one at a time If the problem is external you must check as described in the previ ous points In fact when a patient s limb is inside the coil every ex ternal disturbance is increased because the patient acts as an an tenna Therefore at first you must check to see if the shielding parts are correctly applied to the patient and if each ground cable is fixed then check what source could create the rise in noise If you find something such as a personal computer telephone or laser printer that could be a source of noise you will probably have to apply the solutions described previously decreasing the noise level in the room average fft value around 400 until good
82. inates are B 58 opposite to B is below Its co ordinates are 198 Calculate E B A 2 Calculate ppm 20 5 113 63 x E F0 4 NOTICE F0 is the central frequency of the magnet in MHz Fig 94 2 0 Cos calculation Aras Pro srv000275 File View Call Scan Tools Window 7 214 2 g 4 erR x 128 y 128 8300096009 VER D 133 Magnet Procedure 134 2 1 els from the center and D in figure do that the mouse prompt on the image and on system will show the co Load the correct image from ARAS ordinates on the left bottom corner C is the top right pin Its co ordinates are 176 C where C must be measured by putting the mouse cursor exactly at the center of the black pin Aras Pro Srv000010 dcm 0 B is the top left pin Its co ordinates are 80 B where B must File View Call Scan Tools Window mo sma be measured by putting the mouse cursor exactly at the center 2939 of the black pin SIS A opposite to B is below Its co ordinates are 80 A and A TE must be measured by putting the mouse cursor exactly at the center of the black D opposite to is below It co ordinates 176 0 and D must be measured by putting the mouse cursor exactly at the center of the black pin e Calculate EZ A B C D 8 Fig 95
83. ing of the transmission coil In this case change the value of the fixed matching capacitors Remember that the sum of the left side matching capacitors must be equal to the sum of the right side matching capacitors Touch the TX Coil with your hand close to the circuit to find out if you have to increase or decrease the capacitance value to ob tain the correct matching value If the value of the matching increases you must decrease the capacitance If it decreases you must increase the capacitance Decrease or increase the capacitors by a small amount then repeat the test checking if the deepness of the peak is at least 12dB You must change at least two capacitors at a time Receiving coil Fig 65 RX Coil hardware connections Introduction System connection SINT This chapter describes the Service coils tuning procedure This procedure allows the Service technician to tune the RX coil in the SINT4 field using the special capacitors kit and RX coils prepared for this purpose T T T 1 m RX Coil connection RX Coil tuning kit Soldering Flat screwdriver medium tip 6 Pincers and 5 SINT F RX Coll SNTS 4 Hardware Connections Open the rear and front covers of the Electronic Unit left side patient view Open the Magnet cover not patient side m m e Disconnect the cable between SINT5 and RFR
84. ion Images Restore Fig 54 Images Backup window To restore the User s images from the created backup act as de scribed m 3 Be The restore procedure erase the images tained on the system Hard Disk NOTICE The restore procedure works only if on the sys tem Hard Disk and on the Backup Cartridge is present the same SW Release and on the same System that created the Backup Cartridge Log the system as SERV and type the correct password Launch the ARAS program Select TOOLS and Images Restore Load the images from the backup cartridge 77 8300096009 VER D Software Repair Page intentionally left blank 78 Host Trouble shooting strategy In this chapter you will find test strategies encompassing the com plete host system Images visualization and storing Image visualization and storing is an important system chain contains all the modules responsible for the last part of the image process The modules contained in this chain are CPU SVGA HD PRINT ODD 1 SCSI CD ROM and CD RW Procedure This section is designed to give the CSE an in depth description of trouble shooting procedures for the complete host system Use the data present in the following section to check the host part of the system 79 8300096009 VER D Host Trouble shooting strategy Repair instru
85. ion class SO Original value 76 found max 31530 posit 196 echo 1 slice 1 max 3915 posit 228 gaini 127 gain2 0 echo 1 slice 1 max 13001 posit 228 gaini 189 gain2 0 new value 74 signal 13686 nev value 72 max signal 13944 nev value 70 wax signal 14073 nev value 68 max signal 14293 nev value 66 max signal 14348 nev value 64 max signal 14408 new value 62 wax signal 14611 nev value 60 max signal 14685 tmt 35 8300096009 VER D System Procedures 36 Service RecFilePlot introduction This section deals with the monitoring and subsequent analysis of various quantities whose time evolution is interesting while evalu ating The characteristics of the environment in which the system must operate with particular reference to temperature and Magnetic DC field strength System adjustments while responding to changing environmental conditions with particular reference to thermal and magnetic compensation activities System parameters with particular reference to central preces sion Larmor frequency and operating noise level This environment is organized in this way analysis of the time evo lution of the above mentioned quantities plays a critical role in iden tifying troubles relating to the presence of incorrect environmental conditions and or damage or malfunctioning of thermal and mag netic compensation units Moreover the analysis pe
86. ld Wizard step 1 5 Esaote S p A E MRI Scan InstallShield Wizard step 1 The procedure goes ahead automatically and will take more or less 30 Don t interact with the system till that the log on mask is shown Check if the inserted data are correct and click on the INSTALL button to proceed with the OPI installation otherwise go back clicking on the BACK button to change the inserted data 73 8300096009 VER D Software Repair 74 Fig 49 8 1A installation step5 installation E Esaote S p A E MRI Scan InstallShield Wizard step 1 SAOTE THE IMAGE OF Installing Esaote S p A E MRI Scan Release 8 1 The program features you selected are being installed Please wait while the InstallShield Wizard installs Esaote S p A E MRI Scan This may take several minutes Generating script operations for action SetRegistryInstallValue InstallShield e f the following message appear click on the OK button Fig 50 8 1A installation step4 E MRI Scan x di Release Note after the System Reboot you must export some images to test DICOM license e After the last re boot remove the ESAOTE CD ROM and perform a log on with every user Serv Servdriver ESAMRI and ADMIN Perform a log on as SERV and check in the IE homepage if the Operating System SP3 has been correctly installed compar
87. less thick In both cases the noise is selective but when the strip is thin this means that the noise has only a single frequency On the other hand if the strip is thick it is typically a frequency modulation Instead the spikes could be classified as a large bandwidth problem that is usually generated by poor power supply or by certain motors e g from elevators air conditioning etc In the same way you can study HF interference using the Rx Chain service menu Also in this case you can have different kinds of disturbance 1 A well determined RF interference one thin strip on the image 2 A frequency modulation example band of strips on the image In the first case set lt FFT gt mode in the RX Chain ARAS pro gram lt Test gt and lt Manual gt environment to see a thin peak whereas in Echo modality a sinusoidal signal will appear While if a frequency modulation case 2 is present on the images always in lt FFT gt something like narrow rectangle formed by a given number of peaks will be displayed Fig 19 Example of selective noise with a given frequency 44 Fig 20 RX Chain test FFT visualization Ch NOIS E When this window appears select the FFT mode then the A visualization and apply these settings to all the chan nels right button mouse check the lt Apply to all chan nel gt box then click on lt OK gt
88. lized and the customer created his own protocols Images Back up To create a User s images backup act as described Log the system as SERV and type the correct password Launch the ARAS program Select TOOLS and Images Backup Fig 38 Images Backup window Insert an empty optical cartridge and store the images 65 8300096009 VER D Software Procedure 66 Repair Complete Software installation AX WARNING Use this procedure only if the proce dure contained into the Installation Guide Software chapter doesn t work properly or in case of HD failure or in case of OPI incorrect starting WARNING Using this procedure all the data con tained into the HD will be lost during the formatting procedure of the Oper ating System installation Operating System SW Installation e Switch on the system Type the DEL key during the BIOS boot and enter in the BIOS SETUP menu typing the correct password that same as the user SERV NOTICE Ask the correct Password to your headquarter Select the BIOS FEATURES SETUP menu and set the following Boot Sequence using the PAG UP PAG DOWN keys CDROM A C Take the WIN2000PRO CD provided with the System and insert it into the CDROM the CD must be inserted into the CD RW if installed Quit from the BIOS SETUP saving the new configuration and the System will perform a re boot automatically NOTICE For
89. load different load different varicap value Change the varicap value 0 255 and see if the voltage value changes if not means that the RFR is broken or that the cables from the RFR to the Coil are broken short circuit 8300096009 VER D 41 System Procedures 42 Fig 17 System Check Gain 1 2 Aras Pro SN 8 System Check GAIN 1 2 PEPE The Gain signals are opera tional amplifier gains pres ent into the RFR module Performing a Scout acquisi tion using the Knee Coil 1 and the Geometrical phan tom in axial position Gain 1 must be lower than 255 and Gain 2 must be zero Change the Gain values 255 and check if it s pos sible to move the trace on monitor 255 10V If the traces don t change their values means that the RFR is broken Fig 18 System Check RF pulse Aras Pro Scope System Check RF PULSE View Cal Scan Scope Tools Window 7 2 DODD db zm m gt p 3m 2800 mv 2400 mv 2000 A 1600 mV 1200 mv 800 mv 400 mv 2800 2400 mv 2000 mv 1600 1200 mV 800 400 157 407 yA 2279 167 mV 2279 167 mV 0 5200 32 54 96 128 160 192 224 256 Trace A B Time Sample
90. lts placed under it Take out all the screws from the Gantry edges operator and patient side Remove the metallic cover operator side taking out all the screws Disconnect all the gantry cables Place one hand inside the Gantry and slide it out Remove the shimming plates left and right Slide one hand between the shimming plate and the iron pole till to reach the other side shimming plate edge Move the shimming plate to the magnet center then slide it out Repeat this procedure to the other shimming plate Insert again the Gantry and place the metallic cover to avoid thermal instability Shimming parameters correction From ARAS select the lt Tools gt menu and the lt Shimming gt button Fig 98 Shimming Menu S File View Call Scan Tools Window 7 Ta Image Backup gt Image Restore Insert zero for the correct parameters also if their value is not zero and the real value of the parameter s must be corrected like shown in the next figure Check if the inserted parameters are correct then click on the lt Compute gt button and the system will show a possible solution NOTICE The specification range is ppm 10 Only one parameter can be ppm 15 NOTICE In the position for 2 1 sin coefficient you must insert value zero because we don t measure it 137 8300096009 VER D Magnet Procedure 10 138
91. ment folder then View Rec Folder from this page you have to select the interested day opening it the system will show the compiled rec files Fig 7 REC File folder ew Rec Files View of Day 2001 05 16 Folder 8300096009 VER D System Procedures 31 32 file list Tab 2 Rec file list Rec file name Meaning The file contains the sentences written every time an Error Message Window is displayed The file contains all the sentences writ ten by the Operator Interface dur ing the examination opierr rec The file contains the S N Check ob tained by pressing a button from the Op erator Interface header rec The file contains the image information obtained and viewed by pressing the lt Service gt lt Image info button from the Operator Interface The file keeps a record of the activity of every work session of the Control Inter face opicoi rec The file contains information about the UNIX core file 904 The contains the 90 pulse values The file contains the 180 pulse values varicap rec The file contains the varicap The file contains the 180 pulse values autotar rec This file contains information about two different gain processes Rec file name Meaning The file contains the fine step frequency values freqstep rec The file contains the course step fre quency values The file contains the shielding test values The file contains t
92. mmer number seven is the geometrical distortion trimmer the number eight is the hardware offset and the jumper is the output en able if you remove it the GRA output is disabled OUTPUT 2 SHA Q P E 5 111 8300096009 VER D Gradient Repair 112 Fig 75 Not correct AINT offset Check the Gradients Place the pick up coil in the position of the support Select lt Test gt lt Hardware gt lt X gradient gt then lt Exec gt and wait for the system diascope Click on the Channel and select Coarse offset gt channel Click on the lt Coarse offset gt vertical arrows to transfer the gray trace to the center of the screen This operation allows eliminat ing the offset created by the AINT box Then change the chan nel and select lt Fine offset gt to set the AINT box offset to zero using smaller step than lt Coarse offset gt NOTICE During the whole calibration procedure the offset must be zero NOTICE To better visualize both traces they have two different zero levels the AINT box offset zero level is in the middle of the screen Fig 76 Correct AINT offset X Gradient X GRADIENT The AINT offset must be
93. ned to the correct frequency Besides it is very important to check the impedance matching to 500 Using the TX Coil test check the position and the matching of the transmission pulse e Insert the Coil 2 Knee with the homogeneous phantom into the magnet in axial position then from ARAS select Test lt Hard ware TX Coil Run The pulse is shown in the following figure e Changing the channel select the SPAN STEP field and set it to 100 Hz 8300096009 VER D 97 RF Subsystem Procedure 98 Select RF channel and set it the to 180 Fig 61 TX Coil test Check if the pulse is in the central position of the screen because the magnet frequency is shown at the screen center The maxi mum acceptable range is 2 5KHz from the central frequency Otherwise you must adjust the tuning circuit Check if the highest point of the peak is at least 12dB otherwise you must adjust the matching circuit Receiving Coils Check Following the RX chain you can perform some checks directly on the coil connectors of the Gantry in order to test if the Varicap volt age reaches the coil and from the Coil check the cable continuities to the LNA modules and then to the RFR module the variable capacitors by the same value Example two turns for each capacitor and see directly on the monitor if you are moving the pulse in the right direction Transmission Coil
94. o ESAOTE fill the RMA form in every field indicating ITEM name of the broken module P N part number of the broken module Item Ser N serial number of the broken module System Ser N serial number of the system T R trouble report serial number IC index configuration number only for E SCAN Warranty if the module is under warranty or out of warranty Comments for example write if you need an urgent replace ment of one of the broken modules The Medical Device Directive MDD 93 42 mandatory forces manufacturer distributor and technician to guarantee the Ser N traceability of some system components See the below table Every Trouble Report must have the Ser N of the broken and new components Tab 1 The Ser N of these modules must be written in the Trouble Report Code Components 9102398000 9100773003 9101294000 Insulating Transformer GANTRY 9100934002 LNA 9101310001 9500649100 9700004003 9101585000 9101034001 9101584000 9500877010 Components 9500166010 ACQ 9101533000 GRA 9101598000 RFA 250W 9101148001 9100805001 9700020000 9500792010 9500722000 9102274000 9101721004 9101721005 9100711002 CTERM SINTO2 Electronic Units Left and Right If you don t have the RMA form download it from the ESAOTE web site NOTICE e Send it by fax or e mail to ESAOTE and wait for the RMA authorization form It is a word file that you will receive by e mail
95. of the RFR module The RIB module is installed under the magnet this box is the card devoted to automatic coil acknowledgement The signal is sent to the RIB box through the cable in the RIB4 connector from the GANTRY The signal goes out of the RIB1 connector to the Mag net panel connector R and reaches the DSP inside the PC unit The Varicap driving signal in BRX necessary for the fine tuning of the coil is sent from RFR to the RX coil inserted into the Magnet The voltage can vary between 0 to center 2 1V depending on the digital value between 0 and 255 Fig 57 Magnet basement connections LNA SUPERIOR CODE 9100934002 LNAS RE LNA INFERIOR 9100934002 9101310001 9101588000 AAA This picture shows all the cable con nections present between the mod ules contained into the magnet base ment and from to the Gantry AS a INSULATING TRANSFORMER CODE 8700040001 GANTRY COAX CONNECTIONS Es 9 5 I NTC BOARD f to CH ml pani a E oc mW LL y H Hd BH A D R B E F G T FAST HEATERS 4 8300096009 VER C RF Subsystem Procedure 93 94 Fig 58 Magnet Panel Connectors ERIE 555055559 255252525260 TRANSF
96. oil Therefore you are advised to check that there are no possible sources near the machine and that the shielding is properly sealed The noise level is represented by average_fft whose threshold value is written in the software and has been set taking into account the situation of the first machines Please note that this calibration may also be performed from the operator s interface as a diagnostics scan 54 Repair In case of not perfectly shielding efficiency check all the system grounds or provide a dedicated ground If you noticed that a RF spike causes noise of images shift the magnet central frequency changing the NTC board send an order to ESAOTE specifying system ser n magnet ser n magnet fre quency frequency of the RF noise and desiderated new magnet frequency the image problems are generated by magnetic interference fol low this chapter to compensate them Procedure Magnetic Compensation This chapter describes the Magnetic Compensation Procedures for external DC and AC 50 60 and 16 6 Hz noise Necessary tools Gradient Tuning Service Kit e Magnetic Compensation Kit e Small and flat screwdriver Allen wrenches 4mm Sources of DC Interference Trucks subways elevators escalators and fans or other kinds of iron masses running close to the magnet can generate DC noise NOTICE It is possible to compensate only one DC source Sources of AC interference Power cable or
97. oise because it s possible to reduce the internal field Tab 3 Dip switches configuration for 50 Hz DIP SWITCH LSB MSB DECIMAL 2 6 10000000 mi poo oo 00001010 8300096009 VER D 61 System Repair 62 Tab 4 switches configuration for 60 Hz DIP SWITCH LSB MSB DECIMAL 6 1 10000000 forgo iso s 00000010 When the correct dipswitch configuration is found turn the trim mer AC try both directions to decrease the internal field The specification is less than 25000 e fthe internal field doesn t reach the specification repeat the pro cedure e f the white trace is displayed larger with respect to the gray trace you are overcompensating rotate the trimmer in the oppo site direction and try again Fig 36 Internal field compensated At the end of the compensation procedure fix the probe to the wall using the suitable screws Part4 Software Trouble shooting strategy Software repair is a difficult task due to the complexity of today s software In most cases the first question that comes to mind is Is the prob lem caused by hardware or software Reinstalling the software will answer this question quite reliably but will possibly cause other problems such as loss of data e g im ages of patients customer protocols or system specific dynamic
98. otstrap and if i s completed successfully you are advised to run the alarm diagnostics With this procedure you can check whether amplifiers GRA and RFA and CTERM are op erating correctly In the event of a malfunction a message appears identifying the failed module The acronyms used have the following meanings GRA OFF direct power supply failure to the gradient amplifier This event may also be due besides to the fuse being blown or a disconnected 220VAC cable etc to failure to receive ac knowledgement from the CTERM module GRA gradient amplifier malfunction failed PLL connection of its internal switching amplifier and or output voltage clamp Not significant when GRA OFF is present RFA OFF direct power supply failure to the RF amplifier This event may also be due as well as to the fuse being blown or disconnected 220VAC cable etc to overheating of the ampli fier T gt 5090 RFA RF amplifier malfunctioning duty cycle over 25 and or reflected power greater than 40 watt Not significant when RFA OFF is present CTERM direct power supply failure to the CTERM module This event may also be due as well as to the fuse being blown or to a disconnected 220VAC cable etc to overheating of at least one side of the magnet This failure is detected by the temperature sensors 2 in series located on the side or by a short circuit or an open circuit on at least one of the four groups of the NTC senso
99. pin e Calculate E C B D A 8 e Calculate ppm 21sin 159 51 x E FO NOTICE FO is the central frequency of the magnet in MHz 135 8300096009 VER D Magnet Procedure 136 2 2 do that the mouse prompt on the image and system will show the coordinates on the left bottom corner Bis at the center of the partition Its co ordinates are 128 B A is at the left side of the screen at a distance of 70 pixels Fig 97 2 2 Cos calculation horizontally and a few pixels offset vertically depending on the in homogeneity 5 co ordinates 58 gt Aras Pro srv000275 View Call Scan Tools Window 7 C opposite to B is at the right side Its co ordinates are 198 amp s Dg e Calculate D C B 2 Load the correct image from ARAS 5000275 e Calculate ppm 22cos 75 01 x D F0 ppm 20cos NOTICE FO is the central frequency of the magnet in MHz x258 y2129 e Identify the co ordinates of three points on the vial s partition one at the center and two at a distance of 70 pixels horizontally Access to the shimming plates The GRA must be disabled while dis AX WARNING connecting the gradient cables Disable the GRA disconnecting the power cable rear side Remove the magnet covers Leg Lock Motion Device LLMD side Remove the LLMD taking out the for bo
100. plitude 1 2 Volt are correct Another way is to use the AINT service module Bad tuning of the transmitting coil If the ratio is about 1 i e all the power is reflected the problem could be due to a bad connection between RF amplifier and transmitting coil or a broken component inside the transmitting coil For example the central capacitor on the tuning circuit inside the gantry A wrong value of the frequency set in the Homogeneity cali bration As for the receiving chain you are advised to use the standard ma chine settings central frequency search noise level S N for the various receiving coils and sequence calibration etc Procedures Recording files introduction This section explains the possibility of evaluating information re garding the system operations In fact this information is written in some recording files which can be seen by the operator The following paragraph gives the recording files list in which the name of every file is followed by an extension name The Rec Files contain all the operations performed by the system Some of them are generic other are more specific The system cre ates a new folder every day and every folder contain only the rec files filled in that day All the rec files are self explaining and not always are created by the system every day To have access to the rec files open the Internet Explorer and from the homepage open the Rec File Manage
101. pter every six _ inspection of the integrity of the external Power light check inspection of the green light and the every six switch placed in the left cover of the Electronic months box 150 Page 1 of 4 TX signal control for transmission coil Power cord check brush or com pressed air spray DESCRIPTION TOOLS amp FORMS PROCEDURE FREQUENCY DONE N A OK NOK Electronic Unit and PC internal dust cleaning Cleaning and func tional check of the cooling fan with the exception of the CTERM ones test of insertion in the gantry Patient seat control Screwdrivers Phil ips tip medium size standard tip Allen key 4mm Screwdriver stan dard tip Allen key n 4 brush or compressed air Following the standard procedure shut down the system Open the Electronic Unit covers and open the PC unit Using the brush remove any dust from the boards removing them from their places if needed At the end of the cleaning pro cedure connect everything again and check for proper functioning Following the standard procedure shut down the system Open the electronic unit covers not pa tient side to get access to the fan and remove any dust Be careful of the two smaller fans for CTERM module which are still in function At the end restart the system and check fan functional ity then close th
102. ptional lights is located on the filter panel and has the following characteristics 250V MAX and 5A MAX No dimmer or fluorescent lights may be used All the main power cables and the ca bles from the console to the filter panel and from the filter panel to the magnet must be inserted under the floor or into the delivered duct that must be fixed to the floor WARNING 147 8300096009 VER D Power Distribution Repair Fig 106 Power distribution Scheme 148 EXTERNAL 100 110 200 220 1230 240 FILTER INSULATING TRANSFORMIER 1300 VA ELECTRONIC UNITS SWITCH GRA CONTROL SINT Part 12 Maintenance Instructions Maintenance Plan The system maintenance does not require any critical or difficult operations but some periodic controls are summarized in the fol lowing table NOTICE At the end of maintenance procedure take a copy of the table that has been filled in and file it in the Logbook 149 8300096009 VER D Maintenance Instructions Maintenance Plan Tab 11 Maintenance instructions period six months year Performed by System Customer Date DESCRIPTION TOOLS amp FORMS PROCEDURE FREQUENCY DONE N A OK NOK System calibration Quality Form See the Installation Guide calibration chapter every six control months See the Installation Guide calibration cha
103. r software solution heck polarities and positions of the neodymium pieces 8300096009 VER D Magnet Procedure 129 130 From OPI perform a Scout scan and set the anatomical area as Shimming Parameter Acquisitions other then check its position Click on Protocol list gt then select the Shimming Test 2 0 2 0 Cos Cos sequence Place the vial in coil 3 upper limbs along the magnet s axis us ing its suitable support and make sure the partition is in vertical 2 1 Cos Place the geometrical phantom on the suitable support in the Knee coil 1 in Coronal position Fig 90 Correct vial position From OPI perform a Scout scan and set the anatomical area as other then check its position Click on Protocol list gt then select the lt Shimming Test 2 1 Cos gt sequence 2 2 Sin Place the geometrical phantom in the Knee coil 1 in Axial posi tion using its suitable support From OPI perform a Scout scan and set the anatomical area as other then check its position Click on lt Protocol list gt then select the lt Shimming Test 2 2 Sin gt sequence 2 2 Place the vial Large Knee 2 by using its special support Perform a lt Scout gt and set the anatomical area as knee then in vertical position and make sure the partition is in horizontal di check its position rection
104. rategies encompassing the com plete control system Procedure This part contains the exchange procedures and the necessary adjustment procedures Please observe normal safety precautions in connection with the particular area in which you are working and overall safety precautions in general This part is designed to give the CSE an in depth description of trouble shooting procedures for the complete control system DSP test To perform the standard peripheral controls the procedure is CNTR test Follow this procedure to perform the CNTR test Necessary tools Not necessary Operation Refer to the System Check description 8300096009 VER D 87 Control Trouble Shooting Strategy Repair instructions This chapter contains repair instructions encompassing the com plete control system Change DSP Switch off the system and disconnect the rear power cable from the PC unit Open the PC unit Take out the broken DSP and change it Close the PC unit Reconnect the power cable and switch on the system Refer to the following table for necessary tests and adjustment Tab 7 Test and adjustment MODULE TEST 88 Change CNTR or TRDIFF boards Switch off the system Open the Electronic unit left patient side covers front and rear Disconnect all the cables from the Control box Remove and open it Take out the broken board and change it Close the Control box and in
105. rformed over a long period of time can provide meaningful information from a sta tistical point of view about the relationships between failures and certain environmental conditions In order to provide a complete tool the monitoring procedure can be performed in three different ways characterized by different time ranges For a maximum period of a day lt System Monitor gt short pe riod analysis e For a maximum period of one year System History gt analysis performed over a part of the lifecycle of the system e During a cycle of thermal stress lt Stress gt analysis performed over a maximum period of three days the appropriate se quences inspect the system s thermal stress by observing the relationships among the measured quantities listed below The practical tool used to inspect the quantities versus time func tions resulting from the monitoring procedure is again the scope whose characteristics and functions are tailored for this spe cific application as described below Monitored quantities Three folders are available under the lt Hist gt icon of the ARAS tool bar lt RecFilePlot System History gt lt RecFilePlot System Moni tor gt and lt RecFilePlot Stress gt They make it possible to display the data items previously collected with one of the time ranges de fined above Here is a detailed list of the monitored quantities NOTICE These files are created by the system only wh
106. rs After verifying that the standard part of the PC successful comple tion of the bootstrap routine without any error messages and the power modules GRA RFA and CTERM are operating correctly with the diagnostic alarms you can proceed to run the System Check diagnostic If the plot operates correctly it is safe to as sume that generally speaking the control subsystems DSP and CNTR and the acquisition subsystems DSP and ACQ are oper ating correctly too In particular it is best to first display the values relative to the driving of the receiving subsystem modules RFR and BRX which are generated and monitored from within the mod ACQ Their correct behavior confirms substantially that acquisi tion is operating correctly From System Check you can also verify the correct operation of Gradients and RF Pulse Regard ing the RF pulse you must know the correct amplitude ratio be tween transmitted and reflected RF pulse Pg P gt 4 which shows that the connection is correct and that the transmitting coil BTX tuning is correct Conversely the absence of the RF pulse may be due to A malfunction of the SINT module if for instance the module is not receiving power fuse cable etc You can also make sure that the SINT is working at the correct frequency To test this connect SINT5 the local oscillator output normally con nected with RFR4 to a scope and check that the frequency fo and the signal am
107. s the correct value depending on the country main power supply and check if it s interrupted Fuse 15A for 100 110VAC supply voltage Ch T Fuse 6 3A for 220 240VAC supply voltage Ch T The secondary fuse already inserted in the secondary stage of the transformer is Fuse 6 3A for 220 out put voltage Ch T Other kinds of fuses are used in the system the position of some of them is shown in the following figure They are accessible without removing or opening the modules Remove the small cover on the main power plug of these system modules to change their fuse or check that they work Their values are indicated in the next table Other fuses are present in the system modules and their values are indicated in the following table Tab 10 Fuses values and position CTERM 16 4 These fuses present in the spare part installation kit The equipment must be permanently connected to the mains Power supply 100 110 220 230 240 VAC 10 50 60 10 Hz 1 3kW refer to the Site Planning Guide NOTICE A TWO POLE SEPARATING SWITCH MUST ALWAYS INSTALLED BETWEEN THE MAINS AND THE SYSTEM Grounding is required An electric wire with minimum nominal cross section of 1 5 mm must be used to ground the equipment according to EN 60601 1 If the mains is equipped with a feeder circuit breaker the system must be connected to a standard two pole separating switch If the mains is no
108. se of pulsating gradi ents After another 10 seconds the screen will turn into a 2 channel oscilloscope displaying on the left a large window displaying a pair of signals at the rate of about one pass per second and on the right column containing a menu of commands A detailed explanation is given in the following paragraph Please note that data is acquired with a 16 bit resolution in a two s complement mode and the display range of our oscilloscope with Res Div 1 0 and Displacement 0 is between 32768 and 32767 Values exceeding the display range are shown with a tan gent line to the upper or lower edge of the window Displacement is relative to the visualization and not to the signal The message Note 26000 Incorrect scan duration that is dis played when quitting is not a warning of a malfunction but rather indicates the time longer than in a normal scan that the System Check gt environment has been active Functions You can run the following tests from the System Check environ ment e X Y and Z Gradients Coil Driving e Receiving Chain Driving e Transmission Chain Driving The control software operating on the DSP sends on cable HSSLO the digital data which are necessary to CNTR PCB Both CNTR and DSP are in the PC unit Within the CNTR command data are processed and transformed into analogue signals driving the gradient amplifier GRA and sent to the same amplifier by the GRA cable and reac
109. se to 1 you can locate the error by con necting a 50 Ohm load to RFOUT f you cannot see the direct pulse the RFA is out of order f you see the direct pulse this means that the trouble is on the cables or on the Gantry Check if the transmission circuits in the gantry are tuned to the cor rect frequency which may be out of tune or not adjusted the signal going out from SINT5 allows checking of the frequency If the fre quency is correct check the tuning capacitor inside the gantry with a tester to identify any open or short circuit It is thus possible to check both the correct envelope form gener ated with the contribution of the DSP CNTR and SINT modules and of course of the RFA module and the quality of the coupling with the transmission coil BTX If the ratio between the two direct and reflected voltages measurable in lt gt is less than 4 there may be a tuning problem on the transmission coil or a malfunction in the RFA output If the ratio is close to 1 e g the tracks are virtually overlapping the RFA BTX connection may be broken Channel 7 is used to modify the sampling frequency of the acquisition subsystem Sampling rate corresponds to the time base of a regular oscilloscope and allows enlarging or reducing the RF pulse envelope In this case too before displaying the two signals click on Scale then select the Dec mode on the y axis so that the values on the
110. sert it Re connect all the cables and close the Electronic unit Switch on the system Refer to the following table for necessary tests and adjustment ADJUSTMENT DSP Try to acquire one image No adjustment required CNTR From ARAS select Test lt Hardware gt System check gt adjustment required and look for the gradient the X Y and Z input to the SGRA module Part 7 RF Subsystem Trouble Shooting Strategy General One of the essential prerequisites for the excellent image quality of an MR system is a correct and stable RF system However due to the complexity of a MR system image quality is influenced by a great variety of components and functions such as Communication systems e g general data transfer etc Control systems e g Host etc Image generating systems e g RF system gradient system etc Image acquisition processing and archiving systems Software performance For more explanations about the module described in this chapter refer to the Functional Description manual RF chapter 8300096009 VER C RF Subsystem Trouble Shooting Strategy 89 90 Procedure Transmitting Coil Driving A description of the process and identification of the modules re sponsible for the transmission process is shown in the following figure Fig 55 Transmission chain description coil driving RF pulse GANTRY HD
111. sert the DRIVER CD and select the correct drivers e f the window Digital signature not found appears means only that the driver are not certified by Microsoft and press YES to close it Click on FINISH and re boot the System 8300096009 VER D 85 Host Repair instructions 86 Computer board set up The table lists the adjustments required after replacing individual boards or assemblies Tab 6 Test and adjustment MODULE TEST ADJUSTMENT PC MODEM PC PRINT BOARD PC SCSI DEVICES ODD CDR CDWR Try to connect the system or vice versa try to connect a No adjustment required to the system Try to connect the system to another system Insert the new Filter Codes Explorer Options Check the BIOS refer to this chapter when the system is Load into the software system the correct driver booting the Solaris software for the CPU SVGA Service Utilities Try to print some images No adjustment required Check if the operator system recognizes the SCSI No adjustment required Try to read some images from the ODD Switch on the system go inside the bios set up and recog Insert the system data and the customer s pro nize the new HD tocols repeat all the system calibrations Check if the operator system recognizes the drive Check the jumper on rear side Try to read some images from the drive Part6 Control Trouble Shooting Strategy This chapter contains the test st
112. sition is be tween the noise source and the magnet but not too close to the noise source cables and ferromagnetic material at the level of the magnet center if possible There should be a mini mum distance of 1 meters between probes AC and DC Turn the AC trimmer clockwise until you reduce the internal field as much as possible If you cannot meet the specification turn the AC trimmer slightly clockwise then change the dip switches configuration as in the following steps Change the dip switches configuration to shift the compensation signal phase to minimize the internal field There are 8 dip switches number 1 is the LSB number 8 is the MSB The possi ble combinations are from 00000000 to 11111111 following the mathematical binary code rule It means that the LSB value is more or less 3 for 50 Hz See the next table for dip switches configuration conversions Start with 20 step dipswitch 4 and increase the dip switches configuration to reduce as much as possible the internal field When the noise is over compensated come back 20 and start with smaller adjustments dipswitches 1 to 3 Now try again with the AC trimmer to reduce the internal field till to meet the specification maximum 1 5mG NOTICE Also changing the dip switches configuration the internal and external noise don t shift on monitor It s possible to understand when the system gen erates a signal in phase with the external n
113. some BIOS releases is necessary to press a button in order to perform the boot from CD ROM Now the System performs the boot from CD if the written Press any key to boot from CD appears press ENTER When the window Welcome to setup appears press ENTER to continue Press F8 to agree with the End User License Press ESC to continue with the installation without repairing the present software if you are installing on a brand new HD this message doesn t appear Press D to delete the current partition Press ENTER and then L to confirm the previous selection Press ENTER to start the SW installation Choose the NTSF partition and press ENTER At the end of the formatting procedure the system copies the data on the HD and then performs some re boots In the Regional Setting window check if the English lan guage and US Keyboard are set then press NEXT In the Personalize your software window insert the System data then press NEXT In the first WIN2000PRO setup window Your Product Key insert the Product Key code copying it from the label placed on the Computer case then press NEXT In the second WIN2000PRO setup window Computer Name And Administrator Password insert the Computer Name but leave empty the Administrator Password field then press NEXT In the third WIN2000PRO setup window Date And Time Set tings check if the present DATE and TIME settings are correct then press NEXT In the fourth WIN2000P
114. t equipped with a feeder circuit breaker the sys tem must be connected to a 16 A feeder circuit breaker These switches must have been approved according to the interna tional and or national and or federal and or local regulations in force and they must be installed in a wall mounted sheltered box near the unit Wiring between the system and the switches must be via the three wire cable supplied with the system itself It must be cut to the ap propriate length and cable end sleeves must be inserted before inserting them into the terminal connection This cable is 10 m long and the nominal cross section of each of its wires is 1 5 This wiring will be permanent therefore the cable can be removed only by means of a special tool e g a screw driver The yellow green wire is the grounding wire it must be connected to the ground terminal on the main line The brown wire is the phase wire it must be connected to the phase terminal on the separating switch The blue wire is the neutral wire it must be connected to the neutral terminal on the separating switch Be sure to correctly identify the phase and neutral wires when connecting the equipment or when wiring the sepa rating switch WARNING If additional optional lights are installed the pavilion you must install a dedicated separating switch and insert the power cables into a dedicated duct to avoid electric shocks The dedicated plug for the o
115. tal support for the transportation of the magnet Be careful that screws etc or other foreign metallic bodies do not fall into the equipment because they could cause a short circuit Be careful with the cables coming from the unit they should be positioned so that they do not represent an obstacle otherwise they could break causing damage to the unit and could be haz ardous for both the patient and opera tor 121 8300096009 VER D Magnet Trouble Shooting Strategy 122 Procedure Thermal Control Check The magnet must always be at the correct temperature to achieve this result two dedicated modules have been fitted to the system The first one is the CTERM module that provides for the magnet to keep the desired temperature It is installed on the electronic unit between the RFR and the SINT modules and connected to the magnet through the NTC board The CTERM through CTERM2 connector is connected to ACQ module it sends the reference signal concerns the power output and temperature errors on the four sides of the magnet CTERM can disable SGRA by sending on the GROFF cable con nected between the CTERM1 connector and the ENABLE of GRA Its function is to protect the gantry if the temperature on at least one side of the magnet is higher than 0 5 C compared with the normal magnet operating temperature or if the magnet temperature is too low it switches the heaters and SGRA off The second is
116. tes doe ee ea uses 137 Simulation of examinations esee 49 SING iecit 95 Software 66 TWANSTORMON hic u u 145 Source 55 IPIE ERR 97 Sources 55 TX Coil Driving 90 cre M C 38 TX System Check sesenta 91 System 63 System Check a a sassa Sas 39 U System functionality esee 15 icio 37 LJestkeynbaleo 22 System 2 38 W T Window messages text syntax 11 22 Tablesof Contents eoi iere 3 Thermal control 122 155 8300096009 VER D Index 156 Page intentionally left blank Table of Contents Patient Handling Power Distribution Maintenance Instructions 2 a gt a 5 o tc Introduction Service Policy System Software Host Control Gradient Magnet Index Tbd
117. tom load Click on the OPI lt Protocol list gt on lt Geometrical Distortion Measurements gt and then select the sequence lt GRY Gain transverse gt Display the reconstructed image in format 1 Zoom in the image if necessary Select lt Distance gt icon and measure from the left pin to the right pin horizontally from edge to edge between the pins at 60 mm the measurement has an error exceeding 1 of the ideal value calibrate the gain of the Y gradient rotating the Y trimmer 7 one turn 0 4 mm NOTICE The reference values for the pins at 60mm are 59 4 mm 60 6 mm 117 8300096009 VER D Gradient Repair 118 Fig 82 Acquired image displayed 1 format Opi view Sean Image Measure Window Help jg a 2 2 520 Protocols List Protocols F Geometrical distorsion measurements gt E Gain Sagittal GRY Gain Transverse GRZ Gain Coronal 4 62 S N measurements Coil 1 standard kr Z Uniformity measurements Homogeneity verifications amp Z S N measurements Coil 2 large knee RE S N measurements Coil 3 hand and w Z shimming Z Standard sequences S raS Patient Database Scan Name Protocol Status Duration Execution Time Scout Done 00 21 5 15 2001 9 10 18 Gain Transverse Geometrical distorsion measur Done
118. ty The silver coins glued laterally always have a positive polarity use them to check the polarity of the neodymium pieces that you have to place and don t forget that positive polarity on the left plate means negative polarity on the right plate NOTICE You only need to check one position because the neodymium pieces are glued on symmetrical positions Fig 100 Shimming plate the shown positions refer to the written example Symmetrical A P nmm i N A x position S w Ls 11527 d am EI 8 san DJ m 2 i gt position f you type Yes the system will show the entire solution follow it step by step to avoid errors Place the neodymium pieces on the shimming plates making sure about their positions dimensions and polarities comply with the software indications Regarding polarity use the lateral neo dymium coins as a reference their polarity is always positive in every magnet Use double sided tape and paper tape to fix the pieces do not use glue for the moment 8300096009 VER D NOTICE Positive for the right shimming plate means negative for the left shimming plate and vice versa Fig 101 Complete Shimming Solution 139 Magnet Procedure Fig 102 Shimming Plate Reference Polarity 140 AVANTI DESTRO ALTO VISTA
119. ure gradient amplifier not powered 26524N RF amplifier failure RF amplifier not powered 26525N RF amplifier failure RF amplifier not powered and gradi ent amplifier not powered 26526N RF amplifier failure RF amplifier not powered and gradi ent failure 26527N RF amplifier failure RF amplifier not powered gradient failure and gradient amplifier not powered 26528N RF amplifier failure RF amplifier not powered and cterm failure 26529N RF amplifier failure RF amplifier not powered cterm fail ure and gradient amplifier not powered 26530N RF amplifier failure RF amplifier not powered cterm fail ure and gradient failure 26531N RF amplifier failure gradient amplifier not powered cterm failure gradient failure and RF amplifier not powered 26600W the signal after sweep calibration is in the wished range 26601 W the signal after sweep calibration is not in the wished range 26602 W during gain sweep calibration there is no signal 8300096009 VER D System Strategy 29 30 Broken Modules Identify A malfunction involving the CPU HD SVGA monitor keyboard mouse and optical disc and or relative SCSI card should be im mediately obvious since their operation or failure is plainly visi ble If the message Non recoverable error Scan disabled ap pears this means that the software has found problems with one or more modules which compound the system Try to repeat the bo
120. urpose of this calibration is to check that no external noises are present in the signal picked up by he coil such as radio frequencies which would generate lines or light spots on the image Moreover the procedure checks that the noise level does not ex ceed a pre set threshold value Fig 27 Line generated by radio frequencies The program is based on running a sequence that carries out a simple acquisition of the noise picked up by the receiving coil By submitting it to Fourier s transform you can detect the spikes re sulting from external radio frequencies and to calculate the average noise level Necessary tools Geometrical phantom and its support Operations Position the knee coil 2 with the geometrical phantom placed in axial position From the ARAS program select lt Tests gt lt Automatic gt lt Shielding gt then lt Run gt Look at the message sent by the calibration procedure If this was not successful do not continue but rather check the store file noise rec Exit by clicking on lt OK gt button Fig 28 Shielding Test m Sequences S Automatic Frequency BhFrequency step 1 Tuning Gain RF180 Shielding Temperature Alarms Manual 30 MS_IfNe gt if 1 1 goto 40 31 Getfile Remote TMP_REC_FILE Local Work Local tmp rec GetFile Code OK 35 MS_AddScanLogger Work Local tmp rec Noise threshold 800 sampling rate
121. us figure The pulse values are different for every system the displayed 90 Pulse value is obtained dividing by 2 the 180 pulse value of the system Knee Coil 2 Check the direct and reflected pulses the reflected pulse gray trace must be lower then the fifth part of the direct pulse white trace e f the reflected pulse is equal to the direct pulse something is broken in the transmission chain Open the Console front covers and connect a dummy load to the RFA output disconnecting the present cable e f the reflected pulse remains equal to the direct the RFA module is broken Transmission Coil Check The purpose of transmission coil calibration is to check the impea ance matching to 500 50 and the tuning to the central frequency of the magnet The Diascope allows the display of the return 1055 between the transmitted and the reflected power in dB This waveform has a peak that must be moved to the center of the X axis which means that the coil is tuned to the correct frequency Besides it is very important to check the impedance matching to 500 Operations The purpose of transmission coil calibration is to check the impea ance matching to 500 50 and the tuning to the central frequency of the magnet The Diascope displays the return loss between the transmitted and the reflected power in dB This waveform has a peak that must be moved to the center of the X axis which means that the coil is tu
122. xpected range 23052N There isn t signal during testing field 23100N After calibration the value of 90 pulse is correct 23101 N After calibration the 90 pulse isn t in the wished range 23102N There isn t signal during testing 90 pulse 23150N After calibration the value of 180 pulse is correct 23151 N After calibration the 180 pulse isn t in the wished range 23152N There isn t signal during testing 180 pulse 8300096009 VER D 27 System Strategy 28 23200N After calibration the varicap values in the right range 23201 After calibration the varicap values aren t in the right range 23202N No signal testing varicap tuning 23250N Correct gain value after calibration 23251 N The signal after calibration isn t in the correct range 23252N There isn t signal during calibration gain 23300N Correct encoding gradient 23301 N Incorrect encoding gradient 23302N There isn t signal during encoding gradient calibration 24000N After frequency step calibration the found values are in the wished range 24001 N After frequency step calibration the found values aren t in the wished range 25000N The average of the FFT noise signal is over threshold 25001 N The average of the FFT noise signal isn t over threshold 25002N the are spikes in the signal 25003N media noise over threshold spike in the signal 25100N correct magnetic compensation 25101 N incorrect magnetic compensation Timeout between OPI an
123. y for different proc esses You must know how the system is composed and how it works in order to identify any kind of trouble You can identify some different chains Transmitting gradient driving e Transmitting coil driving Receiving driving Thermal control Images visualization and storing You can perform different tests for every chain to identify the defec tive modules A detailed description of the different chains and the different tests is given below The most useful and powerful test is the System Check test In the next figures the modules positions and connections are shown 8300096009 VER D 15 System Strategy Fig 1 System Layout Electronic Unit PC Unit Fig 2 Left Electronic Unit rear side LEFT ELECTRONICS BOX REAR VIEW L 17 System Strategy 8300096009 VER D 18 Fig 3 Left Electronic Unit front side FRONT VIEW X LEFT ELECTRONICS BOX CONTROL UNIT GROFF 883 1354 111 SINT UNIT 910 158 11 911 2281 110 1 GRAI 882 1356 11 510 0305 001 f RFR UNIT gt 5 311 1712111 CTERM UNIT b b JEN CRIB RCONN UNIT Fig 4 Magnet top view LNA UNIT superior inferior LNA UNIT

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