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Model A101 Exradin CT Chamber User Manual

1. EXC iy A101 CT lonization Chamber REF 92680 er User Manual G www Standard Imaging com EXC iy A101 CT lonization Chamber REF 92680 STANDARD IMAGING INC TEL 800 261 4446 7601 Murphy Drive TEL 608 831 0025 Middleton WI 53562 2532 FAX 608 831 2202 Feb 2005 2005 Standard Imaging Inc DOC 80362 03 General Precautions Warnings and Cautions alert users to dangerous con ditions that can occur if instructions in the manual are not obeyed Warnings are conditions that can cause injury to the operator while Cautions can cause dam age to the equipment WARNING Electrical shock hazard when connected to 300 V bias supply WARNING Exradin lon Chambers are intended for quality assurance and calibration measurements They are not intended to be connected to a patient for real time dosimetry measurements CAUTION Proper use of this device depends on careful reading of all instructions and labels CAUTION Do not drop mishandle or disassemble unit since it may result in a change of calibration factor or damage to thin walled Thimble tip Refer all servicing to qualified individuals CAUTION Do not sharply bend triax cable Damage to the cable may result in high leakage currents Table of Contents 4 General Precautions 5 General Operation 7 Parts and Accessories 8 Features and Specifications 11 Service Notes 12 Service Policy 13 Customer Responsibility 1
2. Standard ear Imaging Products y Standard Imaging Custom Product 90 days Consumables 90 days Serviced Product 90 days Resale Products As defined by the Original Equipment Manu facturer ADCL Product CalibrationADCL Product Calibration Standard Imaging uses the UW ADCL for recalibrations required under war ranty 0 90 days 100 of ADCL Calibration Costs 91 182 days 75 of ADCL Calibration Costs 183 365 days 50 of ADCL Calibration Costs 366 639 days 25 of ADCL Calibration Costs days from date of shipment to customer Standard Imaging s sole and exclusive obligation and the purchaser s sole and exclusive remedy under the above warranties are at Standard Imag ing s option limited to repairing replacing free of charge or revising labeling and manual content on a product 1 which contains a defect covered by the above warranties 2 which are reported to Standard Imaging Inc not later than seven 7 days after the expiration date of the warranty period in the table 3 which are returned to Standard Imaging Inc promptly after discovery of the defect and 4 which are found to be defective upon exami nation by Standard Imaging Inc Transportation related charges including but not limited to shipping customs tariffs taxes and brokerage fees to Standard Imaging are the buyer s responsibility This warranty extends to every part of the product except consumables fuses batteries
3. or glass breakage Standard Imaging Inc shall not be otherwise liable for any damages including but not limited to incidental damages consequential damages or special damages Repaired or replaced products are war ranted for the balance of the original warranty period or at least 90 days This warranty is in lieu of all other warranties express or implied whether statutory or otherwise including any implied warranty of fit ness for a particular purpose In no event shall Standard Imaging Inc be liable for any incidental or consequential damages resulting from the use misuse or abuse of the product or caused by any defect failure or malfunction of the product whether a claim of such dam ages is based upon the warranty contract negligence or otherwise This warranty represents the current standard warranty of Standard Imaging Inc Please refer to the labeling or instruction manual of your Standard Imaging Inc product or the Standard Imaging Inc web page for any warranty conditions unique to the product 14 Sel
4. readings of ionization current may be made immediately after application of the polar izing potential However it is good practice to pause a minute or two after changing the potential to allow switch General Operation Continued ing transients induced in the electrometer to completely subside Such transients are most evident in the rate current mode The CT chamber is designed to measure CT slices These may be summed or integrated as is the standard practice for CT Measurements Thus the MSAD multiple scan aver age dose can be determined as is usual For this reason the response is flat within the length of the chamber Figure 1 shows the flat response of the chamber it is flat to within 3 over the central 10 cm of its length ToT Tt Me go 0 0 0 5 al 08 L 4 r e 04 e bd 4 02 I e e reading normalized to central value ool ee Ds Ja l J Do li Ds 10 8 6 4 2 0 2 4 6 8 10 Stem End Distal End position on chamber cm Figure 1 Flatness of the CT chamber Operating Instructions 1 With nothing connected to the input jack of the elec trometer turn the power on and wait at least 15 minutes for warm up 2 Verify the leakage of the electrometer is within the manufacturer s stated acceptable limits 3 Connect the ionization chamber to the electrometer and apply desired voltage bias 4 Allow the electrometer and ionization chamber system at least 10 minutes
5. 4 Warranty wl 7601 MURPHY DRIVE MIDDLETON WI 53562 2532 USA WWW STANDARDIMAGING COM Standard Imaging E XEU I N General Operation Exradin chambers are attached to a 1 5 m length of low noise flexible triaxial cable that is terminated by a triaxial or coaxial connector The collector of the chamber is common with the center wire of the cable and the center contact of the connector The guard is common with the inner cable braid and the middle connector contact of triaxial connectors and the connector body of coaxial connectors The shell outer electrode usually ground is common with the outer braid of the cable and the connector body in the case of triaxial connectors and the pigtail extending out the rear of coaxial connectors The design of Exradin chambers requires that the collector and guard operate at essentially the same potential The polarizing potential supplied by an electrometer is applied between the shell and the guard Either polarity may be applied to the shell and either the shell or guard may be grounded Safety and other considerations recommend grounding the shell which then requires an electrometer with a floating input All Exradin chambers can support 1000 V between shell and guard However depending on the particular circumstance and radiation intensity as little as 90 V may yield essentially 100 charge collection Because Exradin ionization chambers do not exhibit volt age soakage phenomena
6. change Under normal use the chambers should provide years of trouble free service If assistance is desired in the proper disposal of this product including accessories and components after its useful life please return to Standard Imaging 11 Service Policy If service including recalibration is required please con tact Standard Imaging s Customer Service department by phone or email prior to shipping the product Standard Imaging s Customer Service and Technical Service staff will attempt to address the product issue via phone or email If unable to address the issue a return material authoriza tion RMA number will be issued With the RMA number the product can be returned to Standard Imaging It is the responsibility of the customer to properly package insure and ship the product with the RMA number clearly identi fied on the outside of the package The customer must immediately file a claim with their carrier for any shipping damage or lost shipments Return shipping and insurance is to be pre paid or billed to the customer and the customer may request a specific shipper Items found to be out of warranty are subject to a minimum service fee of 1 hour labor excluding recalibrations for diagnostic efforts and require a purchase order PO before service is performed With concurrence from customer the product may be re placed if it is unserviceable or if the required service is cost prohibitive Products inc
7. electrometer and disconnect the ionization chamber Parts and Accessories REF Description 72170 A101 Acrylic Adapter Sleeve 1 3 mm PMMA 72157 LEMO Connector in place of Triax BNC Plug M F Features and Specifications Collecting Volume Collecting Volume Length Collector Diameter Body Tube Outside Diameter Wall Thickness Chamber Length Body Tube and Guard Mate rial Response Uniformity over the central 10 cm of chamber length Energy Response 80 to 150kVp Collector Material Electrical Power Require ments Nominal Collection Efficiency Maximum Polarizing Potential Nominal Inherent Leakage Currents Low Noise Triaxial Cable Connector Included Adapter Sleeve Operating Parameters Humidity Temperature Pressure Storage Parameters Humidity Temperature Pressure Product Standards 1 Designed to Meet 4 6 cc 10 0 cm 2 4mm 10 0 mm 1 0mm 164 3 mm Shonka air equivalent C552 plastic 13 14 Carbon Fiber Operates at 300 VDC 100 1000 V 10 A 1 5 m long 50 ohms 29 pf ft Triaxial BNC Plug 2 Lug Male and protective cap con nected by chain standard others available upon request Wall Thickness of 1 3 mm Constructed of PMMA 20 to 80 non condensing 10 to 40 C 680 to 770 mm Hg 0 to 95 non condensing 15 to 50 C 600 to 800 mm Hg IEC 60601 1 IEC 61674 C 0413 Notes Notes Service Notes External Mark
8. s The Exradin A101 CT Chamber is provided with 3 external groove marks on the chamber body signifying important locations of the collecting volume The middle groove represents the center of the axial length of the collecting volume The two outer most grooves represent the termi nation of the collecting volume each 5 cm away from the central groove Within these two outer most grooves is the collecting volume that is rated with a flatness response of 3 and is 10 0 cm in length Adapter Sleeve The Adapter Sleeve for the CT Chamber is constructed of acrylic PMMA The Adapter Sleeve has an outer di ameter of 12 7 mm which will fit into most commercially available CT Phantoms Simply slide the Sleeve over the CT Chamber until the Sleeve bottoms on the shoulder of the CT Chamber and insert the CT Chamber with sleeve into the CT Phantom Venting The CT Chamber vents to the ambient via 2 holes located on the cylindrical body of the chamber proper When the acrylic Adapter Sleeve is in position on the chamber body there is adequate clearance for the chamber to vent Underwater Operation This chamber is not waterproof This type of chamber is typically not used in water Service and Maintenance There are no user serviceable parts within this ion ization chamber Under no circumstance should the user attempt to repair or disassemble the chamber and or connector as the warranty will become void and the calibration factor will
9. to stabilize making certain that all cabling is lying flat and unkinked 5 Verify the leakage of the ionization chamber is within the manufacturer s stated acceptable limits If measured in the presence of background sources note that this signal will add to the leakage of the chamber 6 Some electrometers such as the Standard Imaging MAX 4000 Electrometer allow the user to zero the device General Operation Continued at any time If desired perform this system zeroing now 7 Check the system leakage Take a reading without ex posing the chamber to radiation This reading should be less than 0 1 of the final signal expected If it is not the leakage should be subtracted from the signal 8 Measure atmospheric temperature and pressure 9 Insert the CT chamber and take at least 3 measurements Generally the measurements should not be moving in only one direction i e three readings that continue to drop and hence may not yet be stabilized If a current measurement is done allow sufficient time for value to stabilize 10 Analyze the data taking into account the average of the readings system leakage temperature pressure corrections calibration factors and any other appropriate corrections to be made Keep in mind that the calibration factor consists of the electrometer calibration and the ion ization chamber calibration factor 11 When all measurements are completed set bias volt age to 0 VDC turn off the
10. uct has sole responsibility for any malfunction resulting from abuse improper use or maintenance or repair by anyone other than Standard Imaging Inc The information in this manual is subject to change without notice No part of this manual may be copied or reproduced in any form or by any means without prior written consent of Standard Imaging Inc 13 Warranty Standard Imaging Inc sells this product under the warranty herein set forth The warranty is extended only to the buyer purchasing the product directly from Standard Imaging Inc or as a new product from an authorized dealer or distributor of Standard Imaging Inc For a period provided in the table below from the date of original delivery to the purchaser or a distributor this Standard Imaging Inc product provided in the table is warranted against functional defects in design materials and workmanship provided it is properly operated under conditions of normal use and that repairs and replacements are made in accordance herewith The foregoing warranty shall not apply if the product has been altered disassembled or repaired other than by Standard Imaging Inc or if the product has been subject to abuse misuse negligence or accident Product Warranty Period Standard Imaging lonization Chambers year Standard Imaging Well Chambers 2years Standard Imaging Electrometers 2years Standard Imaging Heat Software Products y All Other
11. urring service charges may be held for payment Standard Imaging does not provide loaner products See the Standard Imaging Warranty and Customer Responsibility for additional information 12 Customer Responsibility This product and its components will perform properly and reliably only when operated and maintained in accordance with the instructions contained in this manual and accom panying labels A defective device should not be used Parts which may be broken or missing or are clearly worn distorted or contaminated should be replaced immediately with genuine replacement parts manufactured by or made available from Standard Imaging Inc CAUTION Federal law in the U S A and Ca nadian law restrict the sale distribution or use of this product to by or on the order of a licensed medical practitioner The use of this product should be restricted to the supervision of a qualified medical physicist Measurement of high activity radioactive sources is potentially hazardous and should be performed by quali fied personnel Should repair or replacement of this product become necessary after the warranty period the customer should seek advice from Standard Imaging Inc prior to such re pair or replacement If this product is in need of repair it should not be used until all repairs have been made and the product is functioning properly and ready for use After repair the product may need to be calibrated The owner of this prod

Model A101 Exradin CT Chamber User Manual

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