OPERATORS/SERVICE MANUAL
Contents
1. OPERATORS SERVICE MANUAL for Medspira BC 10Transmit Receive MRI Coils designed for use with GE Healthcare Solutions Signa 1 51 3 0T MRI 4 d CE o p J O i ot Le sw Mn E 6 8 Em ST E Ki _ mi ps TEB ee E Pije a d Authorized European Representative ee ner a na CEpartner4U e Ps GG Esdoornlaan 13 3951 D Maarn t The Netherlands a WWW cepar tner 4u eu Products E X Medspira BC 10 3 0T Excite X Medspira BC 10 1 5T HDX XK Medspira BC 10 3 0T HDX MR750 N Medspira BC 10 3 0T HDX MR750W GEM NON GEM Operators Service Manual MC2617 07 REV 6 13 Manufacturer Medspira LLC 2718 Summer Street NE Minneapolis MN 55413 WWw medspira com MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 1 n cois od oaia E idle UP edi seat 3 2 Co T OPERATORS SERVICE MANUAL for Medspira BC 10Transmit Receive MRI Coils designed for use with GE Healthcare e Solutions Signa 1 5T 3 0T MRI C 0050 Authorized European Representative Ec REP CEpartner4U Esdoornlaan 13 3951 DB Maarn The Netherlands www cepartner4u eu Products Medspira BC 10 3 0T Excite Medspira BC 10 1 5T HDX Medspira BC 10 3 0T HDX MR750 Medspira BC 10 3 0T HDX MR750W GEM NON GEM Operators Service Manual MC2617 07 REV 6 13 Manufacturer Medspira LLC 2718 Summer Street NE Minneapolis MN 55413 www medspira com Al OPERATORS SERVIC2. Lights button to turn the lights on 7 Position the coil to align the coil center mark on the outside of the coil housing using the alignment lights MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 21 8 Place the Phantom in the coil using the supplied spacing rings These will center the Phantom vertically in the coil Note It is critical to align the Z position of the Phantom This is determined by aligning the mark on the outside label of the Phantom with the center mark on the outside of the coil housing 9 Press the Landmark button to landmark the alignment 10 Move the coil to scan position by pushing the Move to Scan button ensuring that the cable does not get pinched or ensnared between the tube bore and the moving patient cradle 11 At the operator console set the acquisition protocol per the Signal to Noise Ratio Protocol 12 Click Save Series to download the protocols 13 Wait at least 10 minutes before proceeding to the next step 14 Run Auto Prescan Record the R1 R2 and TG values from the results of the Auto Prescan If Auto Prescan fails or TG gt 150 perform Manual Prescan to establish the proper TG value 15 Run Scan 16 When the scan is completed run Scan for a second acquisition SNR Coil Setup 22 OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 Signal to Noise Ratio Protocol Table Protocol Patient Exam Information Patient ID Patient Name Patient Weig
3. Netherlands www cepartner4u eu CAUTION Federal law restricts this device to sale distribution and use by or on the order of a physician MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 1 4 Quality Assurance The procedure described in the Section 3 Functional Checks of this manual should be performed upon receipt of the coil to establish a baseline of coil performance The procedure should be repeated at regular intervals 1 5 Safety This manual contains detailed information on the setup positioning and use of the Medspira BC 10 1 5T 3 0T Transmit Receive MRI coils The instructions should be read carefully and thoroughly before attempting to scan patients with the coil 1 5 1 Coil Operating Safety Patient safety and comfort should be the primary concern during the scanning procedure Always follow proper safety operating and maintenance procedures to prevent patient exposure to electrical or mechanical hazards that may cause injury CAUTIONS The following general warning statements apply to scanning with a magnetic resonance imaging MRI system For further details review the warnings in your MRI system operators service manual X Cables should not be looped or crossed as arcing and patient burns could result X Route cables through the center of the magnet bore Place cables under the cushion and away from patients whenever possible Routing near the sides of the bore increases the likelihood of cable hea
4. flakes which can cause skin and eye irritation Permanent eyeliner tattoos may cause eye irritation due to ferromagnetic particles OR i A caurion MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS X MR Equipment shall limit body core temperature rise to avoid undue heat stress and prevent local tissue damage in the body of the patient Patients with a core tempera ture higher than 39 5 C cannot be scanned Patients with a core temperature higher than 39 0 C can only be scanned in normal operating mode X Patients who work in environments in which there is a risk of having embedded metallic fragments in or near the eye should be carefully screened before undergoing an MRI exam X Prevent all cables from forming loops and coming into contact with the patient Contact may result in burns to the patient X Ensure that the patient is comfortably positioned X Monitor the patient periodically Stop the scan immediately if the patient reports any heating burning or tingling sensations X Ensure patient hearing is properly protected during use 1 5 3 Emergency Procedures In the unlikely event that a coil creates smoke sparks or makes an unusually loud noise or if the patient requires emergency assistance X Stop the scan if one is in progress X Remove the patient from the scanroom if medical treatment is needed 1 5 4 Indications The Medspira BC 10 1 5T 3 0T wrist coils will be used in conjunction with several c
5. 13 Section 3 Functional Checks 3 1 Scanner Verification Perform system level Signal to Noise Check Refer to Service Methods CD System Level Procedures Functional Checks Signal to Noise Check 3 2 Coil Imaging Performance Verification 3 2 1 Required Items Description Mayo Part Number Quantity Phantom and Positioner BC 10PK 1 NOTE Phantom bottle is shipped with premeasured contents and solution X 500 mLNalgene IP2 bottle X 0 50 g 0 01 g CuSO4 5H20 X 1 40 g 0 01 g NaCl X 536 mL 1 mL distilled water Please store the Phantom in the same room as the MRI Scanner 3 2 2 Explanation of Procedure The image quality check uses one image acquisition for signal and noise data collection The imaging sequence is spin echo based in order to minimize susceptibility and BO inhomogeneity effects 3 2 3 Signal to Noise Ratio SNR Scan 1 From the Scan Desktop start a new scan by selecting New Patient 2 Set Patient ID to QC and Patient Weight to 111 pounds or 50 kg 3 Click on Patient Position to open the protocols window 4 Place the BC 10 and the Phantom on the patient table as shown in the following photo The coil should be placed on the patient table pad and positioned so that the cable exits toward the coil connection port of the MRI system 5 Set the landmark using the alignment lights to the cross hairs marked on the anterior half of the coil 6 At the magnet press the Alignment
6. Data Sheet Use the table provided below to record the calculated SNR Signal to Noise Ratio and other data to be used as baseline measurements for future comparison Date R1 R2 TG Signal Mean S D of Noise SNR Spec Limit MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS Section 4 Maintenance 4 1 Coil Care Detach coil connector from scanner before attempting to clean Do not reattach after cleaning until coil has dried completely Having the coil attached to the system during cleaning or when it is wet may result in electrical shock 4 1 1 Cleaning Instructions The coil must be cleaned and stored using the following procedures X Wipe with a cloth that has been dampened in a solution of 10 bleach and 90 tap water X DO NOT USE ALCOHOL OR A CLEANER CONTAINING ANY OTHER SOLVENT ON THE COIL X Do not spray or pour any cleaning solution directly on the coil X Let the coil housing dry before use X Store the coil in an air conditioned scan room or equipment room Under no circumstances should the coil be placed into any type of sterilizer 4 1 2 Storage Store the coil in an air conditioned scanroom or equipment room To store the coil a storage space of 20 cm x 20 cm x 20 cm is required Refer to page 13 Table 1 8 for room environmental requirements 25 Medsplra Clini lly inspired mega devices PT o 2718 Summer St NE Minneapolis MN 55914 www medspira com 2011 Medspira LLC All right
7. E MANUAL MC2617 07 REV 6 13 TABLE OF CONTENTS Section 1 Introduction 6 1 1 Operators Service Manual Information 7 1 2 Use ce 7 1 3 Coil Classification eee 8 1 4 Quality Assurance a eee eee eee eeaa 9 1 5 Sar crescuta eat ete eseuri aie ec caciula lieu out ea atit aaa erbacee area oct diaepea 9 E so OIL CODE ee LL Liceeni omu ti talia aia it atv ai J T e E una 2 lea a ee ere E E E E E ee 10 E Teon e E 11 B 1 5 4 e tee e e E 11 MES om E E e RE EER 11 X 1 5 6 Electrical and Mechanical Safety and BD 12 DR FV Ga Eet 12 K dero e Orde ics atei mata lift ta biet ed a Ade 12 1 6 Shipping Contents eee eee eee eee eee eeaeeee 12 1 7 Coil Description 13 1 8 Environmental Requirements eee eee eeeeee 13 1 9 Coil Specifications eee eee eee eee eee eoeeee 14 1 10 Coil Installation and Service ee eee 14 X 1 10 1 Coil Installation Procedure 90 DIA ete IE EE EE 14 III Es e 17 elle Z Se neatentie 18 2 1 Positioning the Col ccc ceeccceecsseeceseessseeseseeseseesesaeeeeeeees 18 2 2 Positioning the Patient 18 2 3 Localizing the Anatomie 18 2 4 Recommended Scan Protocols eee eee 19 MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 5 Section 3 Functional Check 20 3 1 Scanner Verification eee 20 3 2 Coil Imaging Performance Verification 0 0 0 cccc ccc cceeeceeeeeen ee 20 PA
8. e BE 20 DE x aa Ee E 20 NH 3 2 3 Signal to Noise Ratio SNR Sean 20 Se EE 23 Section 4 Mantenance 00 csssesssecssesssesssesssessnesen 25 4 1 Coil Care eee nenea 25 DE een re te 25 EE 25 6 OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 Section 1 Introduction This manual describes the safety precaustions features use and care of the Medspira BC 10 1 5T 3 0T Transmit Receive MRI coils compatibale with the General Electric Medical Systems Signa 1 5T 3 0T MRI systems Please review this manual thoroughly before using the device Manufacturer w Medspira LLC 2718 Summer Street NE Minneapolis MN 55413 www medspira com If you have any questions or comments on this manual or need any assistance with the use of the product please contact a Medspira representative at 800 345 4502 or at www medspira com MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 7 1 1 Operators Service Manual Information The operators service manual provides information on how to use the Medspira BC 10 1 5T 3 0T Transmit Receive MRI Coils The user should read this manual before using the coil for imaging The user is advised to refer to the MRI scanner manual in conjunction with this manual 1 2 Use of Symbols Operators should understand the following symbols used for caution and warning explanations WARNING or CAUTION This symbol alerts you to important operating considerations or potential operating condition that ca
9. ht Patient Position Patient Position Patient Entry Coil Series Description Imaging Parameters Plane Mode Pulse Sequence Imaging Options PSD Name Protocol Scan Timing Number of Echoes TE TR Bandwidth Additional Parameters No entries required in this area Acquisition Timing Freq Phase NEX Phase FOV Freq DIR R L Auto Center Freq Autoshim Phase Correct Contrast Off Number of Reps B4 Pause Scanning Range FOV Slice Thickness Spacing Start S I 0 P A Center I S Center End R L 0 Slices 1 Table Delta NOTE Scan the above twice QC QC 111 pounds 50 kg Supine Headfirst Medspira BC 10 SNR Axial 2D SE Extended Dynamic Range Leave blank Leave blank 20 430 15 63 256 128 Peak On 14 cm 5 mm 5 mm P30 MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 23 3 2 4 SNR Image Analysis SNR Measurement Regions of interest ROI in the images can be measured directly in the image browser Click the user interface button Measure select the circular ROI shape and adjust its size and orientation when the shape is displayed on the selected image The mean standard deviation and area of the ROI will appear in the lower right corner of the image For the signal measurement choose a circular ROI covering the center 80 of the Phantom The ROI should be 2 500 3 000 mm2 and is shown in the following figure The signal is measured as the mean value of this ROI The noi
10. ing the correct cable positioning within the new connector enter the SNR and TG data into the table in Section 3 2 4 General Troubleshooting Review System Log It is important to distinguish receiver coil problems from other system problems Review the system log to see if errors are present at times when the coil is not being used Verify that the MRI technologists are not having difficulty with other imaging coils on this system If errors occur at times when this coil is not being used it is important to address these problems first Check TG If the imaging problems are localized to this coil it may be helpful to know that this is a very efficient transmit receive coil It is possible that the incorrect flip angle was determined by the auto prescan procedure for a specific scan auto prescan may have inadvertently used the 270 degree angle instead of the 90 degree flip angle One way to check this is to review the TG values determined for all series within the problem exam to see if all series are within 15 TG units of each other If the problem image series used a much higher TG improper flip angle adjustment may have occured Alert the technologists to watch for a jump in TG value and conduct a manual prescan to adjust the TG value prior to scanning If this problem continues it may necessitate evaluation of system RF calibration or a change to the config file on your system Config file changes Changes to the config file sh
11. ion discontinue its use and contact your local GE service engineer Do not use coils with exposed metal conductors or damaged insulation Skin contact with metal conductors can cause burns To help prevent a patient burn from closed loops formed by clasped hands by hands touching the body or from thighs or knees contacting over a small area insert nonconducting pads at least 0 25 inches thick between the touching parts 1 5 2 Patient Safety CAUTIONS The following general warning statements apply to scanning with a magneticresonance imaging system For further details review the warnings in your MRI system operators service manual XI If a patient complains of burning tingling stinging or other similar burn type sensations promptly stop the scan procedure examine the patient and contact the responsible physician before continuing the procedure Pay special attention to very young sedated or other compromised patients who may not be able to communicate effectively Patients with ferromagnetic metal should not be scanned because the magnetic field may interact with implanted surgical clips or other ferromagnetic materials Persons with cardiac pacemakers or other implanted electronic devices should not enter the magnetic field zone delineated by the MRI system manufacturer There is a risk to scanning feverish or decompensated cardiac patients Facial makeup should be removed before scanning because it may contain metal
12. l Other Service Please have your service technician contact GE Medical Systems for assistance with any other coil service issues 18 OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 Section 2 Setup 2 1 Positioning the Coil X Remove any other coil or unused accessory device from the magnet before using the coil Patient burns may result from coupling X The coil should be positioned so that the coil cable is oriented down the center of the magnet bore directly toward the scanner connection port Maintaining this orientation which is in alignment with the static magnetic field will ensure proper operation While the coil will operate at peak performance when positioned at the magnet isocenter high quality imaging will also be achieved when it is positioned to the left or right of isocenter X Place a clean cotton sheet sheet not included over the positioning pad inside the coil so that the patient s skin will not come in contact with the coil or the positioning pad X NOTE HDX coils must be connected using the A side X NOTE Do not loop the coil cable in any way 2 2 Positioning the Patient Position the patient either headfirst in the swimmers position or feet first with the anatomy of interest at the patient s side When the feet first orientation is used reposition the patient to the left or right to allow coil placement at or as near to the magnet s center as possible Determine the anatomy of intere
13. n be a risk for impromper function or use of equipment ATTENTION Ce symbole yous alerte sur les conditions op ratoires importantes ou les risques potentiels derivant du fonctionnement anormal de cet appareil Conformite Europene compliance to EMC Directive Product complies with 2002 96 EC Authorized Representative in the European Community Do not cross or loop coil cables Symbol for Manufacturer CAUTION indicates a hazard with a low level of risk which if not avoided could result in minor or moderate injury WARNING indicates a hazard with a medium levl of risk which if not avoided could result in death or serious injury Type BF Equipment Keep Dry Storage and Transport Temperature Limitations Storage and Transport Humidity Limitations 8 OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 1 2 Use of Symbols continued Consult Instructions For Use Package Quantity 1 3 Coil Classification 0 Class Il equivalent al Type BF applied part Ordinary equipment Suitable for continuous operation This product fulfills the requirements of the UL 60601 1 and IEC 60601 1 standards Medical Device Directive These products conform to the requirements of council directive 93 42 EEC concerning medical devices when they bear the following CE Mark of Conformity CE Number 1169 93 42 EEC C 0050 Authorized European Representative CEpartner4U Esdoornlaan 13 3951 DB Maarn The
14. nder Direct Contact 2kv 4kv 8kv synthetic material Test EUT Electrostatic Discharge ESD Contact Floors should be wood No discharge observed 2kv Ak 6kv concrete or ceramic tile no observed response IEC 61000 4 2 Air If floors are covered with from Equipment Under Indirect Contact 2kv 4kv 8kv synthetic material Test EUT 1 5 7 Modifications Any changes or modifications to the coil must be approved by Medspira prior to installation 1 5 8 Reporting of Incidents X Users should contact a Medspira service representative at 1 800 345 4502 or visit the website at http www medspira com immediately to report an incident and or injury to a patient operator or maintenance employee that occurred as the result of coil operation X If an accident occurs as a result of coil operation do not operate the equipment until an authorized investigation is conducted 1 6 Shipping Contents Description Part Number Quantity Medspira BC 10 T R Coil BC 10 X XT 1 BC 10 Phantom Kit BC 10PK 1 Operators Service Manual MC2617 07 1 BC10 Positioning Kit pads and base 1 Material Safety Data Sheet MSDS 1 MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 1 7 Coil Description The Medspira BC 10 Transmit Receive MRI Coil is a quadrature design that has been optimized for specialty high resolution musculoskeletal imaging This design is notable for its demonstrated long term reliability low
15. ommercially available MRI systems to more accurately image a variety of maladies associated with the hand wrist forearm and elbow Maladies include but are not limited to nerve compression ligament injuries tendon abnormalities and scarring Its 10 cm diameter design governs the specific area of the body that can be imaged 1 5 5 Equipment Safety All personnel using the coil should be instructed in the proper connection and handling of the coil To ensure proper operation of this coil the user must ensure that the proper coil configuration has been installed Since this coil is a transmit receive design the BC 10 coil selection must be made for proper operation Remove this coil from the bore whenever the body coil is activated as a radio frequency RF transmitter X Personnel should observe all warnings and cautions that appear in the guide X Auxiliary equipment such as gating equipment vital signs monitoring systems and RF coils that has not been specifically tested and approved for use in the MRI environment may result in burns or other injuries to the patient This equipment may also interfere with the proper operation of the coil The coil is not suitable for use in the presence of flammable anesthetics in combination with air oxygen or nitrous oxide X Prevent cables from forming loops Looping degrades scan performance of the coil through RF coupling 11 12 OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 X This e
16. ould be a rare occurrence and only attempted after other systems tests and adjustments have been made The field engineer should decide if the TG value established for the coil when patients are being imaged is appropriate Note that dramatic changes in this TG value from the time of installation may indicate degradation of the transmitted RF or other system problems If the TG is too high or too low and the auto prescan procedure is not determining the proper TG value you can edit the config file and adjust the transmit attenuation value see below MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 17 Open the config file for this coil in the editor program and move to the line that matches the following This establishes the transmitted RF attenuation value xmitAtten 150 By increasing this transmit attenuation number e g by 10 TG units or 1 dB less RF will be applied to the coil at a given TG value this means that the TG value determined by the auto prescan routine will increase by 10 units The reverse is true as well decreasing this value will decrease the auto prescan TG value Remember that you must reboot the system for any changes to the config file to be operative 1 10 2 Coil Service Coil Cleaning This coil should be wiped daily with a damp soft cloth using a 10 bleach and 90 tap water solution Do not use alcohol or any cleaning solutions containing alcohol or other solvents to clean this coi
17. ows in the figure below Disconnect the cables from their present positions for forward ramped systems and swap their positions for reverse ramped systems The reconfigured connector and BC 10 coil must be tested to ensure that they are set up for the proper magnet orientation Perform a manual prescan prior to conducting the SNR test using the Phantom and protocol as written in Section 3 of this manual specifically see Section 3 2 4 A good signal peak should be evident during the CF coarse portion of the manual prescan even at a low TG setting e g 20 50 If no peak is seen at a low TG it is likely that the cables are not connected in the correct polarity for your magnet The coil should be removed from the scanner and the cable positions inside of the connector swapped as indicated in the previous section After this is done return the coil to the scanner position the Phantom as before and repeat the manual prescan Verify that the signal BC 10 HDX Connection Box 16 OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 level is improved during the coarse CF portion using a low TG setting Leg 20 50 Continue using manual prescan to establish the 90 degree flip angle and then proceed to acquire the SNR image using the methods of Section 3 If the image is low in SNR refer to images and data in Section 3 2 4 for comparison The signal and SNR should dramatically increase when the cables are positioned correctly After establish
18. quipment is not protected against ingress of water NOTE This equipment is rated for continuous operation NOTE Forthe disposal of this coil at the end of its useful life please contact a Medspira MRI coil service representative at 800 345 4502 or contact your municipality or the nearest collection site to dispose of waste equipment 1 5 6 Electrical and Mechanical Testing amp ESD X The coil consists of both electrical and mechanical components Service personnel must have specialized training to ensure the safe operating condition of the coil Therefore only properly trained and qualified personnel should be authorized to service the coil X The electrical and mechanical assemblies and parts of the coil must be used with care and should be routinely inspected X Before using the coil visually check it for any external damage Do not use the coil if the housing or cable is broken X Guidance and manufacturer s declaration electromagnetic immunity The Medspira BC 10 MRI Coil is intended for use in the electromagnetic environment specified below The customer of the BC 10 MRI coil should assure that the user is in such environement Immunity Test Compliance Level Electromagnetic Result Remarks Environment Guidance Electrostatic Discharge ESD Contact Floors should be wood No discharge observed 2kv 4kv 6kv concrete or ceramic tile no observed response TEC 61000 4 2 Air If floors are covered with from Equipment U
19. r Frequency BC 10 1 5T 63 86 MHz HDX E8800RA BC 10 3 0T 127 72 MHz Excite E8800RB BC 10 3 0T 127 72 MHz HDX MR750 E8800R BC 10 3 0T 127 72 MHz HDX MR750w GEM NON GEM HDX MR750 Transmit Receive Coil E8800R Dimensions 23 5 cm W 14 cm H CS ecm 5255 Ginn W 14 cm H 15 cm 15255 cmi W 14 cm H 15 cm 5 23 5 cm W 14 cm H 15 cm The BC 10 is suitable for use in an electromagnetic environment The user of this equipment should ensure that it is used in an MRI environment 1 10 Coil Installation and Service Coil installation and configuration require the services of your trained service representative Please refer to the appropriate sections for coil installation information 1 10 1 Coil Installation Rocedure Software and Hardware Configuration Software Configuration The software configuration file must installed be a qualified service representative MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 15 Hardware Configuration The coil will be sent configured for a forward ramped magnet If this is not appropriate the coil can be reconfigured for reverse magnet ramp operation on site by an appropriately trained service or electronics technician Procedure to reconfigure the coil for reverse magnet ramp operation Open the cover of the connector box using the four screws at each corner Locate the two cable connectors on the circuit board inside of the connector box see arr
20. s reserved MEDSPIRA and associated logos are trademarks of Medspira
21. se measurement is determined by taking the average standard deviation of four ROIs located in the corners of each image outside the Phantom in air Select the circular ROI shape and adjust its area to approximately 10 of the area of the ROI in the Phantom 250 300 mm2 Move the ROI to a corner of the image outside the Phantom but not completely to the top bottom or side edges Note the mean and standard deviations inside the ROI Repeat this measurement for all four corners of each image The noise measurement is the average of all four ROI standard deviations BC10 test Feb 27 2004 01 29 21 PM TE 20 0 EC 1 14 15 6kHz VI 1 7157 8100 mean 7494 55 sd 187 84 area 3120mm2 5 0thk 0 0sp C 2 0 68 mean 23 27 sd 11 98 area 264mm2 1 01 00 3 0 73 mean 22 91 sd 12 68 area 264mm2 2564 128 1 00 NEX WW 8794WL 4397 Ze OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 The image SNR is calculated using SNR mean of signal ROI average standard deviation of noise ROI Calculate the SNR for each of the two images The SNR of the coil is the average of the SNRs obtained from the two images SNR Specification The SNR measurements must be greater than or equal to the following specifications 1 5 Tesla SNR 600 20 e g Signal in Large ROI 6 000 8 000 oo Mean SD in 4 Corner ROIs 10 12 3 0 Tesla SNR 1 100 20 e g Signal in Large ROI 7 000 10 000 eg Mean SD in 4 Corner ROIs 6 9 SNR
22. st via palpation and using the view windows and centering line guide on the coil for accurate placement center the coil at the appropriate location X Provide earplugs for the patient after all instructions have been given X Hearing protection is required for all people in the scan room during a scan to prevent hearing impairment Acoustic levels may exceed 99 dB A X Hearing protection must have a Noise Reduction Rating NRR of 28 dB or better e g 30 dB 32 dB etc X Proceed with scan prescription select HD T R Wrist at the coil screen 2 3 Localizing the Anatomy Align the localizing light so that the anatomy of interest fingers hand wrist or forearm lies at the center of the coil To aid in the centering of the coil in the magnet positioning aids have been provided on the coil in the form of a centering line embedded in the housing and viewing windows to allow MEDSPIRA BC 10 1 5T 3 0T TRANSMIT RECEIVE MRI COILS 19 proper patient positioning within the coil The localizing light should be aligned with the centering line positioned at the midpoint of the viewing windows for positioning accuracy within the bore 2 4 Recommended Scan Protocols X Use the system recommended protocols for scanning with this coil for optimal results and best performance Specific choice of protocols is entirely the responsibility of the radiologist and or technologist conducting the scan 20 OPERATORS SERVICE MANUAL MC2617 07 REV 6
23. ting from induced currents X Do not allow the coil cable to touch the patient patient burns could result Use a thermal resistant material or pad to keep the cable from touching the patient X Route the cables to the connector port in the most direct way without looping or coiling and avoid bending the cable 180 degrees X Visually inspect the cable insulator jacket strain relief and connector boxes before each use If the insulation is broken or if the cable is frayed immediately discontinue use of the device X Remove unplugged coils or unused accessory devices from the magnet bore patient burns could result X Remove blue wire type ECG gating cables from the magnet bore before scanning with surface coils 9 10 OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 Do not use blue wire type ECG leads when you are doing gated scans with this coil as the potential for heating increases Use peripheral gating high impedance ECG leads or thin film ECG leads rather than blue wire type ECG leads when you are doing gated scans When using any coil make sure the patient s body does not touch the magnet bore Use thermal resistant material or padding between the patient and the magnet to prevent burns that could be caused by patient contact with the interior of the magnet bore Use only GE or GE authorized accessory coils and cables Use only accessories in good condition If you suspect that an accessory is not in good condit
24. transmit radio frequency RF power high image uniformity and high image Signal to Noise Ratio SNR The coil dimensions are approximately 10 cm in diameter and length and it can operate at frequencies associated with either 1 5T or 3 0T proton imaging Note that the coil is designed for one imaging frequency only and cannot be switched to perform at multiple field strengths The operating frequency is identified by the part number on the coil The quadrature design improves coil performance and requires appropriate setup to account for the magnetic field direction of your imaging system i e forward versus reverse magnet ramp If such adjustment is necessary this will be accomplished by the service technician conducting the initial setup and checkout of this coil 1 8 Environmental Requirements Store the coil in an air conditioned scan room or equipment room Storage Operating Conditions Barometric Ressure 860 hPa to 1060 hPa 860 hPa to 1060 hPa Humidity 20 to 95 45 to 75 noncondensing noncondensing Temperature 15 C to 55 C 15 C 1059 C 5 F to 131 F 59 F to 95 F 13 14 OPERATORS SERVICE MANUAL MC2617 07 REV 6 13 1 9 Coil Specifications Field Strength Coil Model dech 3 0T 30T 3 0T NOTE Medspira BC 10 1 5T HDX Transmit Receive Coil Medspira BC 10 3 0T Excite Transmit Receive Coil Medspira BC 10 3 0T HDX MR750 Transmit Receive Coil Medspira BC 10 3 0T Part Numbe
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