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MicroStar Reader QA Program

1. 1 o x lt o o o o o o o cc ka S c c 7 8 ka Dose mrad or 10 cGy 25 LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader SOLUTION DYNAMIC RANGE CONTROL Range of the PMT is extended by using two different operating gain modes with different optical stimulation levels WEAK BEAM High Doses STRONG BEAM Low Doses Cross Over Point COP defines transition between both operating ranges Range is selected on the fly When a test dosimeter is analyzed The PMT counts obtained with a brief 0 15 flash of light same as pretest counting duration are compared with the pretest counts obtained at the cross over point COP dose to determine if the Weak beam or the Strong beam readout mode is to be used The appropriate level of stimulation Weak or Strong is then selected and applied for a duration of 1 0 second during which the luminescent signal is collected Provides for a wide dynamic range 5 mrem LLD Occupational Dosimetry to 15 Gy Radiation Oncology 26 LANDAUER E microStar Reader QA Program Characteristics of the MicroStar Reader READER RESPONSE 8 CROSS OVER POINT COP Corrected MicroStar PMT Counts vs Calibrated NanoDot Dose LOW left of COP and HIGH right of COP Dose Regions gt 200 000 12000 mrad 12 cGy Vv c PX a 5 150 000
2. calibrated NIST traceable exposure at 5 Rads Cs 137 662 keV is compared with that of REFERENCE nanoDots whose sensitivity is known to a high degree of accuracy amp precision The test nanoDot Is then labeled re exposed and re read to verify the labeled sensitivity then annealed prior to release to inventory 32 LANDAUER MI microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter SCREENED NANODOT SENSITIVITY ASSIGNMENT s w m m 1 r 1 DN091 042837 CT raw counts TEST nanoDots CREF raw counts TEST nanoDots n test nanoDot dosimeter m m reference dosimeter M total reference dosimeters 5 sensitivity of n th TEST nanoDot Sm sensitivity of m th reference dosimeter r r reading for single dosimeter R total reading repetitions 33 LANDAUER microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter GENERAL PURPOSE GP VS SCREENED NANODOTS SENSITIVITY SCREENED nanoDots RANGE OF gt Population Manufacturer labels all nanoDots ASSIGNMENT extruded from a roll of OSL METHOD material based on the LDR supplied measured average sensitivity for that roll MEASURED BY LDR QC Department Roll LABELED BY GP nanoDot manufacturer 110 Individual Single unlabeled GP nanoDot received from manufacturer undergoes sensitivity assignment and once labeled is retested to verify accuracy of labeled sens
3. ADAPTER _ _ NANODOT SN e ML 5 1 L T MicroStar Adapter Reading Reproducibility Test LANDAUER This test was performed AT READER INSTALLATION DURING ROUTINE QA BECAUSE A NEW ADAPTER WAS RECEIVED COMMENTS LANDAUER MicroStar Reader Linear Calibration Report High Dose Range microStar Reader QA Program RESOURCE Calibration Report Form INSTITUTION University of Timbuktu INSTALLED LOCATION Radiology Room R120 MANDATORY 30 MIN WARMUP PRECALIBRATION READER VERIFICATION 20 STANDARD MEASUREMENTS MAX DRK lt 20 AVG LED within 2 5 CV lt 5 YES YES YES If all precalibration test criteria are met proceed to calibrate the reader ADAPTER TEST LANDAUER READER SN 22222222 INSTALL DATE 1 1 2012 CALIBRATION PROCEDURE Step1 Warmup Step 2 20 Standard Measurements Step 3 Adapter Test Step 4 Perform amp Accept Calibration Step 5 Post calibration QC test RADIATION QUALITY 80 kVp NANODOT TYPE SCREENED CALIBRATION FILENAME CALIBRATION DATE 8 14 2012 CALSETSN ID 598 CALIBRATION DOSE RANGE PRIOR CAL DATE 6 29 2012 DAYS ELAPSED 46 NEW CAL ID CALSET MANUFACTURE DATE 5 29 2012 DAYS ELAPSED READ CAL ID Calibrate Dose Level mrad CV all readings CV lt 596 FACTOR E1 counts mrad ian ins pipi 96 DIFF Linear LD
4. Minimal Temperature Dependence Jursinic Med Phys 34 12 4594 4604 OSLD attenuator m Surface diode attenuator o OSLD distance o Surface diode distance 0 97 0 001 0 010 0 100 1 000 10 000 Dose per pulse Minimal Dose Rate Dependence 45 LANDAUER MI microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter SIGNAL RETENTION FADING OSL Dosimeter Under normal handling and Dose Signal Retention environmental conditions the 100 8 signal loss due to 100 0 spontaneous depopulation of 99 2 ITT traps Is expected to be less Normalized 98 4 than 2 over 6 months or EN no more than 4 signal fade o over 12 months based on x extrapolation of the observed CO 120 180 240 300 rate of fading Days Elapsed Post Irradiation 46 LANDAUER E microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter SIGNAL DEPLETION DUE TO READOUT Using an optical stimulation of 1 0 sec duration reader default typical depletion rates per individua
5. x ray beam Tx 662 keV Cs 137 source Consult the User Manual for detailed procedure TEST by reading a high dose nanoDot ten times Consult the User Manual for detailed procedure LAUNCH MICROSTAR READER QUALITY TION ASSURANCE PROGRAM BY calibration is ide using Landauer supplied CALTEST IMPLEMENTING PERIODIC QC nanoDots included with the Calibration Calset QUALITY CONTROL TESTS LAUNCH PATIENT DOSIMETRY SECONDARY VERIFICATION PROGRAM Consult the User Manual for detailed procedure LANDAUER LANDAUER LOR PROCESS 2012 002A LDR PROCESS 201 2 D01B MicroStar Reader Testing at Installation Page 1 of 2 Turn on the MicroStar Reader and allow it to warm up for atleast 30 minutes prior to use Turn an the computer and launch the MicroStar reader Application Verify basic reader function by acquiring a series of TWENTY 20 repeat STANDARD MEASUREMENTS DRK PMT CAL Consult the User Manual for detailed procedure MANDATORY TEST PASS CRITERIA FOR QA DOSIMETRY DRK 1 5 20 CV sca lt 0 05 CV suo 0 05 COMPARE WITH FACTORY ESTABLISHED BASELINE VALUES RE ESTABLISH NEW BASELINE IF NECESSARY DAY TO DAY VARIATION IN Identity the nanoDot adapter to be AVERAGES SHOULD BE WITHIN 5 OF BASELINE CONTROL used and perform LIMITS i TEST T by a e dose nanoDeot ten times Consult the User Manual for detailed procedure MANDATORY TEST PASS CRITERIA
6. 099 STD MEAS 5 2363 4979 STD MEAS 0 2368 5069 103 STD MEAS 2422 4894 097 STD MEAS 3 240 506 099 STO MEAS 6 248 4923 038 STO MEAS 2 2 4909 098 STD MEAS 1 2425 5062 101 STO MEAS 3 240 587 102 TS 4 FO 4 S 1 AN gd L0 m A MA _ TS a Le LT 5 _ 5 HS 2 _ 9505 STD MEAS 2 2407 4934 039 _ 5 mE ud LE 3 2 5041 STDMEAS 5 4897 038 STD MEAS 7 243 50 098 ALO STO MEAS 3 2386 4395 101 O E E wr Du x Max 25 ss 195 umum 2 AVERAGE 3 son 1900 194 4056 7648 002 CY 0701 oo 0015 004 tesrsratus pass pass pass Data Acquisition Date eee eee en Data Reviewed by Date Name of Institution Installed Location PMT Counts PMT Counts PMT Courts MICROSTAR READER QUALITY CONTROL TRENDS IN AVERAGE OF 5 DAILY STANDARD MEASUREMENTS XYZ Medical Center Reader ID SN 999999 LDR HQ Pre ship testing Date of Man NA YEAR 2011 MONTH SEPTEMBER Install Date PENDING PMIT Response Dark Current Daily Session AVG of 5 Measurements PMT Response to C 14 Source Daily Session AVG of 5 Measurements 6 2 26 2
7. 5 gt m gt gt 8 n lt ee R A 3 A 79 MicroStar Reader Standard Measurements Control Limit Testing Log LANDAUER sss imsTare DATE DRK AVERAGE CAL AVERAGELED sid LED CHECK EITHER OR BOTH NEW LIMIT INSTITUTION INSTALLED LOCATION LANDAUER microStar Reader QA Program RESOURCE nanoDot Reading Reproducibility Form MicroStar Adapter Reading Reproducibility Test LANDAUER All nanoDot adapters typically two are received with your unit should be evaluated by acquiring 10 sequential readings with one high dose nanoDot gt 50 cGy Optionally the test can be performed 3x or with up to 3 different nanoDots No Depletion Correction is applied The acceptance criteria is CV lt 1 Contact LDR Customer Service if the Adapter Reading Reproducibility Test fails ADAPTER e b 8 voor 121101414 COMMENTS PASS FAIL o HE MicroStar Adapter Reading Reproducibility Test LANDAUER All nanoDot adapters typically two are received with your unit should be evaluated by acquiring 10 EA s b sequential readings with one high dose nanoDot gt 50 cGy Optionally the test can be performed 3x or with up to 3 different nanoDots Depletion Correction is applied The acceptance criteria Is CV lt 1 Contact LDR Customer Service if the Adapter Reading Reproducibility Test fails
8. Dose cGy bX c where X the average sensitivity and background corrected raw PMT counts at a given dose level Units for a b amp c when dose units are cGy are cGy counts a cGy counts b amp CGy respectively 43 LANDAUER O 2 au lt O D O 4 D am U 2 Characteristics of the MicroStar Reader Therapeutic Energy Range 6 MV 18 MV 6 MeV 20 MeV D 0 9 C Oz 5 Nro 4 E HA n o LO LO e LO e LO e Oo O co r v lt C PUBIS p DOSLD Surface diode S QHANISU S y 90 120 150 180 210 240 270 300 330 360 30 60 0 9 MeV 12 16 20 MeV Mode and energy 15MV 6 MeV 6 MV Ir 192 Incident angle degrees O Q C 0 dE Q 0 o E 3 4 4 4594 4604 12 Jursinic Med Phys 34 LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader Therapeutic Energy Range 6 18 MV 6 MeV 20 MeV OSLD m Surface diode Calculated diode ES e O Detector signal Dose per pulse Slope 0 3 Relative sensitivity a N AS HE E e e o 5 10 15 20 25 30 35 40 45 Temperature degrees
9. FOR QA DOSIMETRY CV m peodings lt 0 01 To calibrate the reader perform a LINEAR CALIBRATION for both the LOW DOSE and HIGH DOSE operating ranges using the Landauer supplied CALIBRATION Calset nanoDots which have been exposed to a calibrated radiation spectrum appropriate for your application Dx 80 kVp x ray beam Tx 662 keV Cs 137 source Consult the User Manual for detailed procedure MANDATORY TEST PASS CRITERIA FOR QA DOSIMETRY CV lt 0 05 FOR EACH SET OF READINGS AT EACH CALIBRATION DOSE LEVEL LAUNCH MICROSTAR READER QUALITY ASSURANCE PROGRAM BY calibration using Landauer supplied CALTEST IMPLEMENTING PERIODIC QC nanaDots included with the Calibration Calset QUALITY CONTROL TESTS Consult the User Manual for detailed procedure MANDATORY TEST PASS CRITERIA FOR QA DOSIMETRY CV lt 0 05 FOR EACH SET OF READINGS AT EACH DOSE LEVEL AND AVERAGE DOSE READING SHOULD BE WITHIN 5 OF THE QC NANODOT KNOWN DOSE IF YOU HAVE QUESTIONS CONCERNS OR FAILED TEST RESULTS CONTACT LANDAUER CUSTOMER LANDAU ER SERVICE AT 1 800 323 8830 LOR PROCESS 2012 0014 MicroStar Reader Testing at Installation Page 2 of 2 CLINICAL HIGH ENERGY BEAM SPECTRUM CALIBRATION Tum on the MicroStar Reader and allow it to warm up for at least 30 minutes prior to use Turn on the computer and launch the MicroStar reader Application Conduct MicroStar amp DAILY QUALITY CONTROL
10. NANODOTS AND THE MICROSTAR READER LANDAUER microStar Reader QA Program Manufacturing Tests In Light Dosimeters Establish Cross Over Point COP MicroStar Calibration Linearity of Response with Dose Level Reading Reproducibility Lowest Level of Detection LLD Reading Depletion Rate Strong amp Weak Beam Mode 9 LANDAUER microStar Reader QA Program Manufacturing Tests Intrinsic No Dosimeter Required 7 Standard Measurements Electronics PMT amp LED Stability Light Leakage Physical integrity of reader housing LANDAUER microStar Reader QA Program Manufacturing Tests nanoDot Dosimeters 9 Cross Over Point COP PENDING NanoDot Reading Reproducibility 5 nanoDots new adapter key plate 2 new adapters EACH MICROSTAR READER MUST PASS ALL MANUFACTURING TESTS IN ORDER TO BE SHIPPED LANDAUER microStar Reader QA Program Manufacturing Test Summary Report Sheet Reader Serial Test Date Calibration Factors at 662 keV Low Dose Range High Dose Range LANDAUER microStar Reader Certification Factory Established Cross Over Point Standard Measurements DRK Max CAL Avg CV LED Avg CV Lowest Level of Detection LLD 59 LANDAUER microStar Reader QA Program CQ Installation Protocol Tests MicroStar Reader DX amp TX Users Unit arrives on site is unpacked amp s
11. OSL Dosimeter RELATIVE RESPONSE WITH PHOTON ENERGY nanoDot Energy Response Relative to that at 662 keV Cs 137 on 30 x 30 x 15 cm acrylic phantom Response Relative to Cs 137 662 keV Relative Response 0 100 200 300 400 500 600 700 Average Energy keV 40 LANDAUER microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter RELATIVE RESPONSE WITH PHOTON ENERGY nanoDot Energy Response Relative to that at 80 kVp 44 keV on 30 x 30 x 15 cm acrylic phantom Diagnostic Energy Range 20 120 Relative Response Average Energy keV 41 LANDAUER microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter 1 6 LINEARITY OF RESPONSE WITH DOSE AT 6 MV Counts 10 O 00 e IS Measured calculated e N O 200 400 600 800 1000 1200 For most radiation therapy applications response is linear lt 200 300 cGy Jursinic Med Phys 34 12 4594 4604 42 LANDAUER I microStar Reader QA Program Characteristics of the MicroStar Reader For doses gt 300 cGy a best fit to the average sensitivity and background corrected PMT counts versus dose can be established using a 274 order polynomial fit yielding the calibration coefficients CALFACTORS a b amp cina quadratic expression having the form
12. RK lt 20 CVcAL amp lt 0 05 zm Record result on Daily QC form Add data to Excel Trend Report Monitor trends Printable Retrospective M eas u re m e nts 10 31 12 13 14 15 36 17 18 19 20 21 22 233 34 I M 27 4 79 10 3 E 05 was i weed PMTLED amp 5 k be within the 0 05 threshold paramete in their res 17 H T limits DARK 20 5 proposed LED 25 proposed LED PMT 25 proposed Use Process 1D STD MEAS Page 2012 93 Name of Institution MICROSTAR READER QUALITY CONTROL TRENDS IN AVERAGE OF 5 DAILY STANDARD MEASUREMENTS XYZ Medical Center Reader ID SN 999999 Installed Location LDR HQ Pre ship testing Date of Man YEAR 2011 MONTH SEPTEMBER DAY OF MONTH Install Date PENDING AVG CAL AVG LED Normalized Counts Counts LED PIMT Counts Reader Number AVG Dark Counts Measurement Date Time Process Number 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 11440568 STD_MEAS 1 245 5073 099 STD MEAS 2 2390 4932
13. Range 0 to 712 000 mrad CALFACTOR 100000 0 1 8 200000 0 13 ves 2589 QC nanoDot Dose Level mrad CV all readings CV lt 596 Avg Dose Reading mrad 26 DIFF Ll unexposed onu Ll 1 2 20983 0 4 92 200000 0 xr 1104 ves 191223 0 Calibration Verification Status Measurements performed by Calibration Accepted by Medical Physicist Signature 1 2096 Special Instructions Use this calibration factor for projection x ray measurements acquired at approximately 80 kVp Use appropriate correction factors for other kVp NOTE Calibration in high dose range does NOT include unexposed dosimeter readings for background subtraction Post cal QC Test results should be within 5 screened nanoDots Date Time Date Time 84 MicroStar Reader Linear Calibration Report High Dose Range LANDAUER INSTITUTION University of Timbuktu READER SN 22222222 INSTALLED LOCATION Radiology Room R120 INSTALL DATE 1 1 2012 CALIBRATION PROCEDURE MANDATORY PRECALIBRATION READER VERIFICATION Step 1 Warmup 30 MIN 20 STANDARD MEASUREMENTS ADAPTER TEST WARMUP AVG CAL within 5 CV lt 1 AVG LED within 5 CV lt 5 Step 3 Adapter Test YES Step 4 Perform amp Accept Calibration If all precalibration test criteria are met proceed to calibrate the reader Step 5 Post calibration QC test RADIATION QUALITY NANODOT TYPE CALIBRATION
14. 7 28 29 30 321 PMT Response to LED Source Daily Session AVG of 5 Measurements 13 14 15 16 17 18 19 20 21 22 23 25 23 26 27 28 29 30 31 PMT Counts PMT Response NORMALIZED RATIO LED TO C 14 SOURCE Daily Session AVG of 5 Measurements 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 23 26 27 28 29 30 31 LANDAUER microStar Reader QA Program RESOURCE QA Forms Printable PDF or Electronic XLS 9 S 9 9950 High Precision MicroStar Standard Measurement Record Sheet MicroStar Standard Measurement Control Limits Log nanoDot Reading Reproducibility Record Sheet Linear Calibration Worksheet Calibration Log Sheet Non Linear Calibration Worksheet Non Linear Calibration Log Sheet Reader Daily Quality Control Log Sheet Calibration Set Usage Log Sheet LANDAUER 6 6 9 9 microStar Reader QA Program RESOURCE QA Report Spreadsheets High Precision Standard Measurements Test 20 cycles Daily Standard Measurements Trend 5 cycles nanoDot Adapter Reading Reproducibility Linear Calibration Verification Non Linear Calibration Verification Trends in Computed Calibration Factors Trends in Constancy nanoDot readings optional Post Calibration QC reading trends weekly monthly LANDAUER microStar Reader QA Program Future Calset Options for Medical Dosimetry Users Calibration Using Landauer NIST Traceable Reference Dosimeters Will the Perform li
15. C 14 Source Daily Session AVG of 5 Measurements 2 4 gt 5 5 9 30 91 12 23 34 15 16 1 18 19 20 22 22 23 24 7 RR 7 I 22 3 PMT Response to LED Source Daily Session AVG of 5 Measurements 71 LANDAUER microStar Reader QA Program RESOURCES 72 LANDAUER J microStar Reader QA Program RESOURCES Landauer MicroSite WIP See Updates Electronic version of Manuals amp Procedure Flow Charts QC Forms QC Report Spreadsheets Viewable Click Through Educational Presentations How to Instructional Videos Technical White Papers Clinical Application Guides Self study resource list peer reviewed publications amp books Microstar Training Certification via Post Training Self Test FAQ amp Trouble shooting Guidelines LANDAUER microStar Reader QA Program RESOURCE Installation Testing Flow Charts MicroStar Reader Testing at Installation Page 1 of 2 MicroStar Reader Testing at Installation Page 2 of 2 Recommended for Medical Dosimetry Users DX 8 TX CLINICAL HIGH ENERGY BEAM SPECTRUM CALIBRATION Recommended for Medical Dosimetry Users TX only Turn on the MicroStar Reader and allow it to warm up for at least 30 minutes prior to use Turn on the computer d launch the MicroStar reader Application n Turn on the MicroStar Reader and allow it to warm up for at least 30 minutes prior to use Turn on the compute
16. FILENAME CALIBRATION DATE CALSET SN ID CALIBRATION DOSE RANGE PRIOR CAL DATE DAYS ELAPSED 46 NEW CAL ID Step 2 20 Standard Measurements CALSET MANUFACTURE DATE 5 29 2012 DAYS ELAPSED READ CAL ID PA LOW DOSE RANGE CALFACTOR PRIOR Calibrate Dose Level mrad CV all readings CV 596 FACTOR E1 counts mrad 96 DIFF Linear LD Range 0 to 712 000 mrad CALFACTOR QC nanoDot Dose Level mrad CV all readings CV lt 596 Avg Dose Reading mrad 36 DIFF Special Instructions 20000 0 20983 0 4 92 Use this calibration factor for projection x ray measurements acquired at approximately 50 kVp Use appropriate correction factors for other kVp 200000 0 191223 0 Calibration Verification Status NOTE Calibration high dose range does NOT include unexposed dosimeter readings for background subtraction Post cal QC Test results should be within 5 screened nano Dots Measurements performed by Date Time Calibration Accepted by Medical Physicist Signature Date Time MicroStar Reader Linear Calibration Record LANDAUER INSTITUTION University of Timbuktu READER SN it 11111111 INSTALLED LOCATION Radiation Oncology Room D101 INSTALL DATE 1 1 2012 CALIBRATION PROCEDURE MANDATORY PRECALIBRATION READER VERIFICATION 30 MIN 20 STANDARD MEASUREMENTS ADAPTER TEST warmup car omen _ e s w If all precalibration test criteria are met proceed
17. LANDAUER microStar Reader Quality Assurance Program Nicole Ranger M Sc November 2 2012 Senior Research Medical Physicist Confidential Do Not Distribute LANDAUER p microStar Reader QA Program Overview gt Introduction How does OSL dosimetry work MicroStar Reader Characteristics nanoDot Dosimeter Characteristics gt MicroStar Reader QA Program Manufacturing Tests Installation Testing Calibration Daily Preventive Maintenance Available Resources gt Troubleshooting Customer Support amp Service LANDAUER microStar Reader QA Program INTRODUCTION LANDAUER microStar Reader QA Program Introduction The MicroStar Reader Dosimeters Patient Dosimetry QA nanoDot Dosimeter reader adapter nanoDot Dosimeter 25 Environmental e A Occupational y Dosimetry InLight Dosimeter InLight Type 2 Personnel Dosimeter LANDAUER m microStar Reader QA Program Introduction How does OSL dosimetry work The microStar reader and associated dosimeters utilize optically stimulated luminescence OSL dosimetry technology What is Optically Stimulated Luminescence OSL LANDAUER microStar Reader QA Program Introduction How does OSL dosimetry work CONDUCTION BAND BAND GAP VALENCE BAND LANDAUER microStar Reader QA Program Introduction How does OSL dosimetr
18. QUE 7 5 LD CALFACTOR 9 HD CALFACTOR S o 11 599 CTS MRAD po 0 802 3 100 000 8 se CTS MRAD EX ar S 9 i 22 G oT 9 50 000 4 m e Low Dose Calib Data o i z se m High Dose Calib Data 0 I 0 20 000 40 000 60 000 80 000 100 000 120 000 140 000 160 000 180 000 200 000 220 000 Calibrated Dose mrad or 103 cGy 27 LANDAUER How is the nanoDot manufactured High purity ALO is melted at high temperatures and microStar Reader QA Program Physical Characteristics of the nanoDot OSL Dosimeter recrystallized after the addition of dopants resulting in the formation of oxygen vacancies thus creating a unique crystalline structure that is able to trap electrons released from the valence band when the crystal is exposed to radiation The ALO C is then formulated as a powder mixed with a liquid binder before being coated onto a base material and sealed with a transparent film tape Individual nanoDots are punched out from these rolls of AL O C and are then encapsulated in a plastic light tight case LANDAUER microStar Reader QA Program Physical Characteristics of the nanoDot OSL Dosimeter OSL Dosimeter OPEN Disk of Al O C CLOSED 4 mm diameter BAR CODE 0 3 mm thick SERIAL of which 0 2 mm is Al O C p 3 95 4 10 g cm 014091 042837 nanoDot Outer Case Square ABS Plastic 10 0 x 10 0 mm 2 0 mm thick FRONT 0 36 mm thick a
19. R PERFORMANCE AT INSTALLATION AND SHOULD BE REPEATED PERIODICALLY TO VERIFY COMPLIANCE WITH PREVIOUSLY ESTABLISHED CONTROL LIMITS OR TO ESTABLISH NEW CONTROL LIMITS READER WARMUP OF AT LEAST 30 MINUTES IS MANDATORY LANDAUER 0 sra Dare restoare PMT DARK COUNTS DRK MAT rr ri sponse TO SOURCE CAL PMT RESPONSE TO LED ARRAY LED CAL CONTROL LIMITS LOWER 0 95 x CAL_AVG mmm UPPER 1 05 x CAL AVG UPPER 1 05 AVG Pp The MAXIMUM Dark Counts should be lt 20 This 15 also the criteria for ACCEPTANCE for Daily PASS CV should be lt 5 This is also part of the criteria for for Daily NOTE The AVG must be within 5 of the previous result PASS CV should be lt 5 This is also part of the criteria for for Daily NOTE The AVG must be within 5 of the previous result PASS LED CONTROL LIMITS LOWER 0 95 x LED AVG 1 UPPER 1 05 x LED_AVG Record limits on the Standard Measurements Control Limits Log Sheet and on the DAILY Log Sheet LANDAUER microStar Reader QA Program RESOURCE Standard Measurements Log Sheet MicroStar Reader Standard Measurements Control Limit Testing Log LANDAUER INSTITUTION READER SERIAL INSTALLED LOCATION INSTALL DATE AVERAGE CAL AVERAGE LED CHECK EITHER OR BOTH NEW
20. ROSTAR READER microStar Reader QA Program Control Limits The MicroStar QA Program for Medical Dosimetry Users now utilizes Control Limits for all specified tests in order to establish clear criteria for determining whether the reader is performing at acceptable levels for this application LANDAUER M A CA Y m ill Fh LN y SEE mm P emm sa k 1 D 5 z ff EN AC NEM P um an D eum i 4 Y Y no A a A g Y i ma Y p g p E 4 R w A E UT BN Em b y 27 b d b Ll De 7 Ra 1 Mandatory P Performance Thresholds LANDAUER III IV IN HOUSE QC TESTS x DISCONTINUE USE IF MICROSTAR READER DOES NOT MEET MONITORING MANDATORY ON SITE PREVENTIVE PERFORMANCE CALIBRATION amp MAINTENANCE THRESHOLDS INSTALLATION 5 CUSTOMER IMPLEMENTS LANDAUER RECOMMENDED MICROSTAR QA M O N T O R N G PROGRAM LANDAUER LANDAUER IN HOUSE QC TESTS ON SITE CALIBRATION amp INSTALLATION TESTING microStar Reader QA Program Requirement for Continuous Performance Monitoring CUSTOMER IMPLEMENTS LANDAUER RECOMMENDED MICROSTAR QA MONITORING PREVENTIVE MAINTENANCE PROGRAM M O N T O R N G PROCEED WITH CLINICAL DOSIMETRY APPLICATIONS USING
21. STIONS FAQs LANDAUER E microStar Reader QA Program Frequently Asked Questions FAQs FAQ 1 I v2 0 software Is it really necessary that upgrade to v4 3 There are a substantial number of benefits to upgrading to the v4 3 software some of which are 1 The nanoDot serial number is now automatically decoded minimizing errors resulting from the possible use of an Incorrect default nanoDot sensitivity 2 There are new functions that facilitate the implementation of the new MicroStar Quality Assurance Program 3 There are significant new features including the ability to save report export templates to create site specific demographics fields and security features 4 Most importantly at the end of Q1 2013 the v2 0 software will no longer be supported LANDAUER E microStar Reader QA Program Frequently Asked Questions FAQs FAQ 2 Is the MicroStar Quality Assurance Program mandatory Landauer recognizes that individual medical physicists may opt to deviate from or adapt some of the recommended QA program recommendations as they customize their reader QA program to their specific application However Landauer strongly recommends that the default installation protocol and basic reader QA regimen be followed in order to achieve optimal results using the microStar reader Furthermore failure to perform the recommended installation protocol QA tests to verify compliance with
22. SURE DOSES GREATER THAN For dosimetry 300 cGy USE NON LINEAR CALIBRATION applications in the Megavoltage Range how will NANODOT IS ANNEALED BETWEEN USES AND DOSES LESS THAN 300 cGy USE LINEAR CALIBRATION A NANODOT IS NOT ANNEALED BETWEEN USES USE NON LINEAR CALIBRATION nanoDot cummulative dose must be monitored to ensure lifetime dose does not exceed 10 Gy This mode is not generally recommended because of the increasing variance in successive readings as predicted by the rules for error propagation When using mathematical expressions to compute a result the result will always have a variance greater than the largest variance in the individual variables used in the expression calculation LANDAUER microStar Reader QA Program created by customer Recommended Default Dose Levels Linear Calibration use for Doses lt 300 cGy Low Dose Range lt 15 cGy unexposed 5 cGy 10 cGy High Dose Range gt 15 cGy 50 100 200 300 optional cGy NOTE If the COP is lowered such that 10 cGy dose falls in the HIGH DOSE range a separate low dose calibration is not required Add unexposed 5 cGy 10 cGy dose levels to high dose levels Non Linear Calibration use for Doses gt 300 cGy High Dose Range 50 100 300 500 800 1000 1300 cGy These default dose levels are provided for instructional purposes It is the user s responsibility to select a d
23. ader HARDWARE OVERVIEW EXTERNAL To acquire a series of reader Standard Measurement DRK CAL LED readings 1 Rotate dial COUNTER CLOCKWISE left from home position H P to DRK CAL amp LED pausing 1 second at each position until the LED ON Indicator light turns off 2 Rotate the dial CLOCK WISE right back to the home position H P 23 LANDAUER E microStar Reader QA Program Characteristics of the MicroStar Reader STANDARD MEASUREMENTS INTRINSIC reader performance metrics that are designed to reflect the reader response stability by assessing the PMT signal in response to STANDARD stimuli They do not fully represent the conditions under which medical dosimetry measurements with a nanoDot are taken and therefore should NOT be used to adjust or correct readings DRK PMT response to NO stimulus which is an indicator of electronic noise or dark current CAL PMT response to a small exempt quantity of C 14 T 5730 years encapsulated in a powdered phosphor LED PMT response to the LED source used to stimulate OSLDs during readout but with filter closest to the LED retracted 24 LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader OPERATING RANGE 8 PMT GAIN PMT Saturation at High Doses and Counting Errors at Low Doses are Limitinq Conditions 3 100 1000000 c 75 3 2 10000 O 50 m 100 25
24. arison with the start of the year while the PMT trend remains fairly constant Is this normal Normally the CAL readings which reflect PMT response to a long lived C 14 source should be very stable over the course of a year due to the long half life of C 14 and if they did show a consistent downtrend that was due to decreased PMT response it would be likely that the LED readings would show the same general trends The fact that the CAL amp LED trends show differing trend result implies there is something intrinsic to the CAL data acquisition that might impact those results alone A likely explanation might be a buildup of dirt dust on the swing arm filter that 15 otherwise retracted for LED readings recommended corrective action is to clean the filter If cleaning the filter does not resolve the problem the reader should be returned to Landauer for preventive maintenance 116 LANDAUER microStar Reader QA Program Frequently Asked Questions FAQs FAQ 5 My nanoDot Adapter Reading Repeatability test is consistently yielding CV results above 1 0 e g 1 5 2 1 but this test was yielding acceptable results until recently What is the recommended course of action The consistency of nanoDot readings is highly dependent both the reader operating stability which is reflected in the Standard Measurement results AND the mechanical stability of the nanoDot feed mechanism which is highly dependent on the state of the nanoDo
25. bove below Al Oz C BACK p 1 03 g cm NOTE Asymmetric position of dosimeter within case 29 LANDAUER E microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter RESPONSE RELATIVE TO WATER Mass energy Absorption Ratio of Al O to Water Mass energy Absorption Ratio l Photon Energy MeV Kerns RPC 30 LANDAUER E microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter NANODOT SENSITIVITY LABELING Serial DN091042837 The 3 digits appearing after the two letter Alphabetic code e g wd designate the nanoDot labeled sensitivity which is used in the reader dose calculation and is now decoded automatically by the v4 3 software when the nanoDot Sensitivity 0 91 barcode serial number is scanned when performing a reading LANDAUER E microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter GENERAL PURPOSE GP VS SCREENED NANODOTS For General Purpose GP nanoDots the sensitivity is assigned based on the POPULATION i e the measured average sensitivity of the OSL roll from which nanoDots are extruded all nanoDots originating from the same roll are assigned the same sensitivity value but have unique SNs For Screened S nanoDots the sensitivity is based an INDIVIDUAL test nanoDot s measured sensitivity wherein the nanoDot s response to
26. d to perform these mechanical interventions You have the option of sending your reader back for repair by contacting customer service at 1 800 561 2708 If you attempt to un jam the reader follow all instructions TURN OFF AND UNPLUG reader before opening LANDAUER microStar Reader QA Program How to Ensure Accuracy in Medical Dosimetry Results BEST PRACTICES Implement the MicroStar QA Program and monitor reader performance trends Recalibrate the reader as indicated by periodic Post Cal QC verification tests Verify the correct sensitivity is displayed when scanning nanoDot serial numbers prior to reading When reading nanoDots note the form of the dose calculation formula on the reading screen and that the values used in the calculation are correct Always use the average of 3 4 readings to calculate an average estimate of dose for medical dosimetry applications never rely on a single reading Manually verify any suspect dose results LANDAUER um microStar Reader QA Program Recommended QA Test Frequency DESCRIPTION OF TEST FREQUENCY NANODOT READING CONSTANCY DAILY OPTIONAL INSTALLATION AFTER REPAIR 2 AS INDICATED ESTABLISH VALIDATE CONTROL LIMITS AT INSTALLATION AFTER REPAIR AT INSTALLATION ANNUALLY INSTALLATION TESTS AFTER REPAIR MONITORING OF TRENDS IN QA TEST RESULTS x ONGOING LANDAUER MI microStar Reader QA Program FREQUENTLY ASKED QUE
27. er How it works When the LINEAR CALIBRATION mode is enabled when reading test dosimeters the DOSE is computed using the following expression PMT_Counts Dose cGy __ coy CALFACTOR counts dose e SENSITIVIT Y PMT_Counts are background corrected as necessary SENSITIVITY is the relative EFFICIENCY of the TEST dosimeter in comparison to the reference population and is a dimensionless factor LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader How it works THE LINEAR CALIBRATION FACTOR IS GIVEN BY THE FOLLOWING 1 L 1 1 N R C CALFACTOR gt BKGD yA EDD 3 where BKGD y y yel 5 E Dose dose level l 1 L where L dose levels in the range 0 dose level for unexposed dosimeters n n dosimeter n 1 N where N dosimeters per dose level S sensitivity of n dosimeter r r dosimeter reading r 1 R where R of readings per individual dosimeter Cari r reading of dosimeter at It dose level Can r reading of nth dosimer at unexposed dose level LANDAUER MI microStar Reader QA Program Characteristics of the MicroStar Reader How it works UNDERLYING ASSUMPTIONS 1 Unexposed test and or Calibration reference dosimeters are read prior to use to ensure no significant accumulated dose due to natural background or inadvertent exposure 2 T
28. est and Calibration dosimeters are exposed under comparable conditions i e radiation energy amp exposure geometry conditions 3 Test dosimeters have been read at least 10 minutes after irradiation and before signal fading effects might impact accuracy 4 Reader response is required to be relatively constant over time Must maintain stable temperature environment monitor performance metrics and recalibrate reader as necessary LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader HARDWARE OVERVIEW EXTERNAL Carrier Plate LED ON Indicator Adapter Light or Holder Measurement Dial Tray Carrier Drawer 20 LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader HARDWARE OVERVIEW EXTERNAL Power Switch USB Power Cooling Port Input Fan LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader HARDWARE OVERVIEW EXTERNAL To acquire a single reading of ananoDot 7 7 2 SEDA d y RE si arty Sl x ya 25 M X Eo 3 mi Quar A p 220 L T ET 0m s 1 Rotate dial CLOCKWISE 7 TUE right so that arrow points from H P to E1 P 2 Pause until LED ON Indicator i turns off 3 Rotate back COUNTER CLOCKWISE left back to the home position H P 22 LANDAUER E microStar Reader QA Program Characteristics of the MicroStar Re
29. etup Thermal stabilization 1 24 hours Electronic stabilization at least 30 min Reader stability 20 cycles of standard measurements nanoDot reading reproducibility with each adapter Calibration using 80 kVp DX TX users optional Accuracy in dose readings post calibration QC test LANDAUER microStar Reader QA Program Installation Tests MicroStar Reader TX Users only Clinical Beam Calibration Verification Application specific calibration 4 post calibration verification using clinical beam spectra when prescribed dose 15 known to reasonable accuracy i e in radiation therapy RESOURCE White Paper Calibrating the microStar LANDAUER microStar Reader QA Program Geometry for Standard Therapy Calibration Exposure geometry must be consistent with that recommended by Landauer in the microStar white paper Calibrating the microStar Reader 10 cm thick solid water Phantom centered on beam axis such that surface 15 atan SSD of 100 cm 3 4 unexposed screened nanoDots are positioned at beam center on flexible solid water slab Additional thicknesses of solid water added to achieve a total overlying thickness of Amar Typically 6 MeV photon beam Is used dmax 1 5 cm 62 LANDAUER m microStar Reader QA Program Therapy Calibration Protocols How to Choose NANODOT IS USED TO MEASURE DOSES LESS 300 cGy USE LINEAR CALIBRATION Single Use NANODOT IS USED TO MEA
30. fy reader function when used for medical dosimetry applications using nanoDot dosimeters by selecting the nanoDot adapter currently designated for clinical use and verifying the reproducibility of 10 Tepegt readings obtained using a high dose nanoDot read ten times in succession Consult the Daily Quality Control section of the User Manual for detailed procedure MANDATORY TEST PASS CRITERIA FOR QA DOSIMETRY CV ra 0 01 IF YOU HAVE QUESTIONS CONCERMS OR FAILED TEST RESULTS COMTACT LANDAUER CUSTOMER SERVICE at 1 800 373 8830 LANDAUER LDR PROCESS 2012 002 NO REPEAT YES LOG RESULTS amp PROCEED CLEARED FOR CONTINUED USE IN PATIENT DOSIMETRY SECONDARY VERIFICATICHN PROGRAM microStar Reader QA Program RESOURCE Daily QC Testing Flow Chart 89 MicroStar Reader Daily Quality Control Tests Turn on the MicroStar Reader and allow it to warm ug for at least 30 minutes prior to use Turn on the computer and launch the MicroStar reader Application Verify basic reader function by acquiring a series of FIVE 5 re STANDARD MEASUREMENTS DRK PMT CAL Consult the Daily Quality Control section of the User Manual for detailed procedure MANDATORY TEST PASS CRITERIA FOR QA DOSIMETRY DRK 5 5520 CV 5 u lt 0 05 0 05 Verify reader function when used for medical dosimetry applications using nanoDot dosimeters by selecting the nanoDot adapter currently designated fo
31. ion Log Sheet MicroStar Reader Calibration Factor Log LANDAUER INSTITUTION READER SERIAL 1 INSTALLED LOCATION INSTALL DATE 1 BEAM QUALITY 6 MV dmax CALIBRATION PROTOCOL LINEAR DOSE RANGE HIGH gt 15 cGy CALSET PRIOR REFERENCE NEW NEW CALIBRATION CALIBRATION Ee TIME AGE CALIBRATION FACTOR oy pats y send 12 ue FACTOR pr ACCEPTED FOR ID SN LABEL pays Counts cGy nn ID Counts cGy gp USESTARTING MicroStar Reader Calibration Factor Log LANDAUER INSTITUTION BEAM QUALITY max CALIBRATION PROTOCOL LINEAR DOSE RANGE HIGH gt 15 cGy INSTALLED LOCATION lt a DIFF CALSET PRIOR REFERENCE NEW NEW CALIBRATION CALIBRATION ATE OF EW CALIB NAM NEW B n TIME TEMP ETE AGE CALIBRATION FACTOR jx nu sega a 12 cus FACTOR ACCEPTED FOR ID SN LABEL DAYS Counts cGy Ed 1D Counts cGy agp USESTARTING LANDAUER MicroStar Reader Daily Quality Control Tests Tum on the MicroStar Reader and allow it to warm up for at least 30 minutes prior to use Turn on the computer and launch the MicroStar reader Application Verify basic reader function by acquiring a series of FIVE 5 repeat STANDARD MEASUREMENTS DRK PMT CAL Consult the Daily Quality Control section of the User Manual for detailed procedure MANDATORY TEST PASS CRITERIA FOR QA DOSIMETRY DRE lt 20 CV seu lt 0 05 CV 51 0 05 Veri
32. itivity LDR QC Department nanoDot LDR QC Department 34 LANDAUER MI microStar Reader QA Program Factors Impacting nanoDot Dose Accuracy Accuracy of nanoDot labeled sensitivity nanoDot physical mechanical integrity nanoDot adapter integrity Reader LED PMT amp general electronic stability over time Accuracy of reference calibration doses amp resulting calibration factors Number of single nanoDot readings obtained averaged for reading Use of multiple nanoDots for one measurement condition 35 LANDAUER E microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter Recommended Analytical Measurement Procedures RAMPs Use a common nanoDot adapter for both calibration calibration verification and all subsequent readings and SCREENED nanoDots Use calibration nanoDots irradiated to a KNOWN prescribed dose ideally NIST traceable using a clinical radiation beam spectra and phantom geometry that emulates that of intended application e g dmax etc Read nanoDot s four 4 times reject outlier if necessary Read nanoDots between 10 minutes and 360 minutes post irradiation Implement Landauer recommended MicroStar QA Program 36 LANDAUER microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter NANODOT PERFORMANCE SPECIFIED ACCURACY PRECISION GP nanoDots 10 5 SCREENED
33. l reading are 0 05 High Doses Weak Beam gt Cross Over Point gt 15 cGy 0 5 Low Doses Strong Beam lt Cross Over Point lt 15 cGy IMPORTANT Cross Over Point can now be changed by customer in v4 3 and radiation therapy customers can now force a low illumination readout mode 0 05 depletion per reading for all readings regardless of dose LANDAUER M microStar Reader QA Program MICROSTAR READER QA PROGRAM MEDICAL DOSIMETRY USERS LANDAUER microStar Reader QA Program MOTIVATION 49 LANDAUER Ng microStar Reader QA Program Quality Assurance Continuum Quality Assurance is a Process and needs to be addressed at each stage of implementation LANDAUER microStar Reader QA Program Emulates Medical Device Best Practices Manufacturer In house QC Tests On site Clinical Installation Acceptance Tests On going DAILY MONTHLY ANNUAL Performance Testing Monitoring Periodic Preventive Maintenance including Cleaning Re Calibration amp or Repair as indicated LANDAUER LANDAUER IN HOUSE QC TESTS ON SITE CALIBRATION amp INSTALLATION TESTING microStar Reader QA Program Requirement for Continuous Performance Monitoring CUSTOMER IMPLEMENTS LANDAUER RECOMMENDED MICROSTAR QA MONITORING PREVENTIVE MAINTENANCE PROGRAM M O N T O R N G PROCEED WITH CLINICAL DOSIMETRY APPLICATIONS USING NANODOTS AND THE MIC
34. mandatory control limits will make it less likely to achieve the accuracy levels referenced on Landauer s nanoDot specification sheet and consequently Landauer cannot be held responsible for results obtained when the reader is operated under those conditions 114 LANDAUER microStar Reader QA Program Frequently Asked Questions FAQs FAQ 3 After installing v4 3 immediately after performing a reader calibration and then the post calibration verification by performing a test dosimeter QC reading on the reading screen the calibration factor displayed in the dose computation formula 5 displayed as 0 but the computed dose displayed appears to be correct Also the problem goes away with subsequent readings Is this normal This is a known defect in this initial release of the v4 3 software Rest assured that the correct value of the calibration factor is being used in the dose calculation formula which you can verify by performing a second reading Since the standard protocol for medical dosimetry readings is to repeat the reading four times this software defect is not expected to significantly impact users but will be addressed at the first opportunity in Subsequent updates of the v4 3 software 115 LANDAUER microStar Reader QA Program Frequently Asked Questions FAQs FAQ 4 My Average of 5 Standard Measurement Daily QC results measured over a year show a CAL result that is trending down by about 10 in comp
35. nanoDots 5 5 PUBLISHED 01 2012 NOTE Specifications above reflect expected DOSIMETRY performance when Recommended Analytical Measurement Procedures RAMPs are followed k 2 95 confidence 37 LANDAUER I microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter WARNING gt Exposure to visible light will reduce the measured signal of unprotected aluminium oxide Care must be taken to ensure the dosimeter is not mishandled or inadvertently opened after radiation exposure prior to readout gt If dosimeters are not read immediately care should be taken to ensure they are not subject to extreme environmental conditions during transport or storage gt Ultraviolet light will induce measurable signal for unprotected aluminium oxide Take precautions to avoid subjecting unexposed dosimeters to unfiltered UV light sources either during storage or when performing an optical anneal operation LANDAUER microStar Reader QA Program Dosimetric Performance of the nanoDot OSL Dosimeter NANODOT SENSITIVITY amp ACCUMULATED DOSE 1 4 OSLD 34448K OSLD 34636H Sensitivity signal 1x10 Gy E G 0 10 20 30 40 50 6 0 Accumulated dose Gy Best Practice Remove nanoDots from service when lifetime dose gt 10 Gy P Jursinic Med Phys 34 12 4594 4604 a LANDAUER microStar Reader QA Program Dosimetric Performance of the nanoDot
36. nduction band BAND B Trapping of a hole at a deep hole trap C Electron capture release at a superficial level 9 electron trap unstable at ambient temperatures C lifetime sec to min BAND GAP MEE Al D F REGION D Electron capture at medium level dosimetric c trap released by applying optical stimulation O E z IAN E Electron capture at deep level trap released only with high temperatures or UV light F Recombination of a hole and an electron and BAND emission of light at a luminescence center LANDAUER E microStar Reader QA Program Physics of Luminescent Dosimetry Stimulation Modes OPTICAL STIMULATION MODES POSL vs CW OSL Pulsed Optically Stimulated Luminescence P OSL readers utilize a pulsed light source laser or LED and although accurate are costly to manufacture due to gating electronics high power laser cost etc Stimulation and emission spectra are temporally separated Continuous Wave Optically Stimulated Luminescence CW OSL readers employ Light Emitting Diodes LEDs that illuminate the Al 0 C dosimeter continuously during readout cost effective use inexpensive LEDs and do not require gating circuitry optical filtration removes the majority of stimulation spectral components that would otherwise be transmitted and included in the emission luminescence spectra LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader How it
37. near calibration of the nanoDots amp DX reader using the Landauer supplied microStar be 80 kVp Calset used for dosimetry at Diagnostic DX Perform linear calibration of the or Therapeutic TX reader using the Landauer supplied TX energies Cs 137 662 keV Calset 662 keV TX therapy provides a set of reference dosimeters irradiated under controlled conditions that can be used to verify the MicroStar performance independent of clinical systems but should not be used for clinical dosimetry 97 LANDAUER microStar Reader QA Program RESOURCE Landauer supplied 80 kVp nanoDot Calset NOTE New Calset Configuration Available 1 quarter 2013 CALIBRATION SET Prior Dose Levels cGy New Dose Levels cGy Unexposed Unexposed Low 0 5 1 0 Low 3 0 10 0 Low 50 0 50 0 High 100 00 100 00 High Unexposed Unexposed Low 1 0 1 0 Low 100 00 High Unit Conversion 1 1000 mraq Dose Range designation when Cross Over Point COP default setting is unchanged 98 LANDAUER microStar Reader QA Program RESOURCE Landauer supplied 662 keV nanoDot Calset NOTE New Calset Configuration Available 1 quarter 2013 CALIBRATION SET Dose cGy Dose cGy Unexposed Low 1 0 Low 50 0 High 5 0 Low 100 0 High 10 0 200 0 High Dose cGy Dose cGy Unexposed Low 1 0 Low 50 0 High 10 0 Low 200 0 High Unit Conversion 1 cGy 1000 mrad Dose Range designation when Cro
38. os A family of training videos specific to medical dosimetry users medical dosimetry clinical applications are being planned Watch for announcements on the Landauer MicroSite nttp solutions landauer com microstar 105 LANDAUER M microStar Reader QA Program DOCUMENTING READER ISSUES MicroStar Reader Incident Report Page 1 of 2 LANDAUER INSTITUTION READERS INSTALLED LOCATION INSTALL DATE CATEGORY OF PROBLEM PROVIDE ADDITIONAL DETAILS ON PAGE 2 READER HARDWARE misteed Tray nanoDot Jam ADAPTER NANODOT MICROSTAR SOFTWARE MICROSTAR DATABASE CONNECTIVITY INTEGRATION COOOL 15 THIS THE FIRST OCCURRENCE WAS CUSTOMER SERVICE NOTIFIED WAS THE RESPONSE TIME ACCEPTABLE Yes ves ves No No No WERE OPERATIONS IMPACTED WAS THE PROBLEM RESOLVED ADDITIONAL COMMENTS ves ves No No ESTIMATED DOWNTIME Hours __ avs MicroStar Reader Incident Report Page 2 of 2 LANDAUER INSTITUTION INSTALLED LOCATION INSTALL DATE DATE TIME OF INCIDENT INCIDENT REPORTED BY DATE TIME REPORTED Detailed description of problem Describe how the problem was resolved Incident Report Reviewed by Date of Review LANDAUER microStar Reader QA Program Trouble Shooting The Landauer User Manual includes instructions on how to perform simple mechanical trouble shooting You are not obligate
39. ose calibration protocol that is most appropriate for their clinical application Contact Landauer Customer Service for additional guidance 64 LANDAUER E microStar Reader QA Program Guidelines when using Calibration QC nanoDots For microstar calibrations performed using a Landauer supplied CALSET dose level must be obtained from the Calibration Certificate Calibration QC Calibration verification nanoDots are not to be used for other purposes to avoid inaccurate calibration due to depletion effects Frequency of use of CALIQC nanoDots needs to be tracked to avoid excessive depletion which can impact accuracy Calsets will have finite lifetime before they should be retired recommended lifetime for Calsets used in medical dosimetry is no longer than SIX MONTHS Calsets reused often may need to be replaced sooner 65 LANDAUER microStar Reader QA Program Guidelines for Calibration Frequency MINIMUM IDEALLY At Installation After repair service Whenever QC Accuracy Test Fails On a regular proactive schedule microStar Reader QA Program ROUTINE LANDAUER microStar Reader QA Program Daily QC Tests MicroStar Reader Daily QC Tests DX amp TX Users D Warm up at least 30 min 2 5 Cycles of Standard Measurements S nanoDot reading reproducibility 10 sequential readings Constancy nanoDot reading OPTIONAL Aside from the warm
40. r Standard Measurement Control Limits LANDAUER reaver sere mstaueviocanon nspa TWENTY CYCLES OF THE STANDARD MEASUREMENTS SEGUENCE DRK CAL LED SHOULD BE PERFORMED TO VERIFY READER TEST DATE K PERFORMANCE AT INSTALLATION AND SHOULD BE REPEATED PERIODICALLY TO VERIFY COMPLIANCE WITH PREVIOUSLY ESTABLISHED CONTROL LIMITS OR TO ESTABLISH NEW CONTROL LIMITS READER WARMUP OF AT LEAST 30 MINUTES IS MANDATORY PMT DARK COUNTS DRK The MAXIMUM Dark Counts should be lt 20 This is also the criteria for ACCEPTANCE for Daily OC PASS FAIL PMT RESPONSE TO C 14 SOURCE CAL The CV should be lt 5 This is also part of the criteria for ACCEPTANCE for Daily NOTE The AVG must be within 5 of the previous result PASS FAIL PMT RESPONSE TO LED ARRAY LED The CV should be lt 5 This is also part of the criteria for ACCEPTANCE for Daily NOTE The AVG must be within 5 of the previous result 17 PASS FAIL CAL CONTROL LIMITS LED CONTROL LIMITS LOWER 0 95 x CAL_AVG LOWER 0 95 x LED AVG LII UPPER 1 05 x CAL_AVG UPPER 1 05 x LED_AVG UPPER 1 05 x AVG Record limits on the Standard Measurements Control Limits Log Sheet and on the DAILY OC Log Sheet MicroStar Reader Standard Measurement Control Limits ws 0 0 0 0 0 0 0 wwstaueptocaion TWENTY CYCLES OF THE STANDARD MEASUREMENTS SEGUENCE CAL LED SHOULD BE PERFORMED TO VERIFY READE
41. r and launch the MicroStar reader Application Verify basic reader function by acquiring a series of TWENTY 20 repeat STANDARD MEASUREMENTS DRK PMT CAL Consult the User Manual for detailed procedure Conduct MicroStar amp DAILY QUALITY CONTROL tests to verify reader performance Consult the MicroStar Reader Daily Quality Control Tests section of the User Manual Identity the nanoDot adapter to be Using the clinical beam spectrum of interest and recommended geometry Le 6MV high used routinely and energy photon beam and nanoDots positioned on the beam axis and at a depth of dmax within a solid water phantom JREADIATE the nanoDots 3 per rp dose level to generate a calibration and post calibration QC test set READER using the recommended protocol Calibration dose ranges levels and mode To calibrate the reader perform a LINEAR CALIBRATION for linear vs non linear will be dictated by the clinical application Consult the Micro tar both the LOW DOSE and HIGH DOSE operating ranges using User Manual for the recommended default clinical calibration ales new Micro tar the Landauer supplied CALIBRATION Calset nanaDors which have been exposed to a calibrated radiation E CALIE LOC CHECK to verify the Calibration and that the Calibration Factors are spectrum appropriate for your application Dx 80 kVp loading correctly Consult the User Manual for additional details as necessary
42. r clinical use and verifying the reproducibility of TEN 10 repeat readings obtained using a high dose nanoDot read ten times in succession Consult the Daily Quality Control section of the User Manual for detailed procedure MANDATORY TEST PASS CRITERIA FOR QA DOSIMETRY CVio Readings 0 01 IF YOU HAVE QUESTIONS CONCERNS OR FAILED TEST CLEARED FOR RESULTS CONTACT CONTINUED USE IN LANDAUER CUSTOMER SERVICE at 1 800 323 8830 PATIENT DOSIMETRY SECONDARY VERIFICATION LANDAUER PROGRAM LOR PROCESS 2012 002 LANDAUER o O au lt O D O 4 D am U 2 9 RESOURCE Daily QC Form LANDAUER READERSERIAL MicroStar Reader Daily Quality Control INSTITUTION INSTALLDATE NANODOT ADAPTER READ INSTALLED LOCATION z snm 5 50r cGy 91 DAUER READER SERIAL 0 has 4 gt gt 4 x Mm O hee 2 INSTITUTION INSTALL DATE INSTALLED LOCATION un EE Avg 1 10 Counts or cGy NANODOT ADAPTER READ ING REPEATABILITY DOT SN Adapter AVERAGE LED Av AVERAGE CAL Avg 1 5 MAXIMUM DRK E TEST DATE LANDAUER I microStar Reader QA Program Monitoring Reader Performance Trends Obtain a series of FIVE 5 Standard Measurements Export Data from Microstar to Excel Verify results are within limits D
43. ss Over Point COP default setting is unchanged 99 LANDAUER E microStar Reader QA Program RESOURCE Bibliography of Peer Reviewed Publications Examples Jursinic PA Changes in optically stimulated luminescent dosimeter OSLD dosimetric characteristics with accumulated dose Med Phys 37 1 132 140 2010 Jursinic PA In vivo dosimetry with optically stimulated luminescent dosimeters OSLDs compared to diodes the effects of buildup cap thickness and fabrication material Med Phy 38 10 5432 5440 2011 100 LANDAUER microStar Reader QA Program SCHEDULED PREVENTIVE MAINTENANCE amp SERVICE LANDAUER Landauer Customer Service Contact Info 800 561 2708 Or inlightcustserv landauerinc com 102 LANDAUER M microStar Reader QA Program TROUBLESHOOTING SUPPORT microStar Reader QA Program Recommended approach to trouble shooting LANDAUER 1 Consult the Landauer User Manual 2 Consult the MicroStar MicroSite Frequently Asked Question FAQs section 3 Contact Landauer Customer Service by phone 800 561 2708 by email inlightcustserv landauerinc com How your inquiry will be routed General Issues Customer Service Rep Mechanical Software InLight Product Specialist Advanced Applications Medical or Health Physicist 104 LANDAUER E microStar Reader QA Program W I P Trouble shooting and Clinical Application Vide
44. t adapter First verify that the Daily 5 Standard Measurement Test results are acceptable If so repeat the nanoDot Adapter Reading Repeatability test with the backup adapter you should have received two with your reader If the test passes install the new adapter and label the prior adapter as defective and remove it from clinical use Contact Landauer CS to order an additional backup adapter In the event the adapter change does not resolve the problem call Landauer Customer Service for additional guidance 117 LANDAUER microStar Reader v4 3 Software Frequently Asked Questions FAQs FAQ 6 notice that when export dosimetry data calibrations to MicroSoft Excel that the magnitude of the calibration factor is always the same regardless of the selected units prior to export However the label on the calibration worksheet agrees with the chosen units for data export What is going on This Is a recently discovered v4 3 software defect that is still being investigated calibration factor is being exported in units of mrad ALWAYS even when other export units are selected The label of the calibration worksheet is therefore only correct when mrad units have been selected prior to export There are TWO options 1 Export data in mrad units ALWAYS to avoid this issue 2 l there is an absolute need to export data in other for instance cGy units proceed with the export and go to the Calibration tab in the expor
45. ted file and compare the magnitude of the calibration factors with that recorded in the MicroStar software and adjust the magnitude in Excel so that it is in agreement while also verifying that the worksheet labeled units are correct in this case Calibration cGy 118 microStar Reader QA Program For additional FAQs news product updates consult the Landauer MicroSite at nttp solutions landauer com microstar 119 LANDAUER M microStar Reader QA Program QUESTIONS OR COMMENTS 2 LANDAUER NEED ASSISTANCE For specific questions regarding your microStar dosimetry system please contact Landauer s InLight customer service division at 800 561 2708 Or inlightcustserv landauerinc com A Landauer technical representative will be happy to assist you and will direct your questions to a medical or health physicist as necessary 121
46. tests to verify reader performance Consult the MicroStar Reader Daily Quality Control Tests section of the User Manual Using the clinical beam spectrum of interest and recommended geometry Le 6MV high energy photon beam and nanoDots HA on the beam axis and ui of dmax within a solid water phantom IRBADL le nang generate a calibration and icc iuh READER using the recommended protocol Calibration dose ranges s medi linear vs non linear will be dictated by the clinical application Consult the MicroStar User Manual for the recommended default clinical calibration protocol for new MicroStar ays read nanoDots 4 times to achieve reliable results Perform a O CHECK to verify the Calibration and that the Calibration Factors are loading correctly Consult the User Manual for additional details as necessary MANDATORY CALIBRATION AND POST CALIBRATION QC VERIFICATION PASS CRITERIA FOR QA DOSIMETRY USING SCREENED NANODOTS AND AVERAGE OF 4 READINGS CV 0 05 FOR EACH SET OF READINGS AT EACH DOSE LEVEL AND AVERAGE DOSE READING OBTAINED WITH THE QC NANODOTS SHOULD BE WITHIN 5 OF THE KNOWN DOSE LAUNCH PATIENT DOSIMETRY SECONDARY VERIFICATION PROGRAM IF YOU HAVE QUESTIONS CONCERNS OR FAILED TEST RESULTS CONTACT LANDAUER CUSTOMER SERVICE AT LANDAUER LDR PROCESS 2012 D01B 1 800 323 8830 LANDAUER microStar Reader QA Program RESOURCE Standard Measurements Work Sheet MicroStar Reade
47. to calibrate the reader Step 5 Post calibration QC test RADIATION QUALITY CALIBRATION FILENAME CALIBRATION DATE CALIBRATION DOSE RANGE PRIOR CAL DATE DAYS ELAPSED NEW CAL ID LAST LINAC QC DAYS ELAPSED READ CAL ID Estimated CROSSOVER Dose at Step 1 Warmup Step 2 20 Standard Measurements Step 3 Adapter Test Step 4 Perform amp Accept Calibration MicroStar Cross Over Point COP Setting at time of Calib ds stated beam quality HIGH DOSE RANGE CALFACTOR PRIOR Calibrate Dose Level cGy CV all readings CV lt 5 FACTOR E1 counts cGy Linear HD Range COP to 300 cGy DIFF 50 692 ves 623555 gt 40 18 vwes 6502 20 11 ves esnm9s so 114 641816 QC nanoDot Dose Level cGy CV all readings CV lt 5 Avg Dose Reading cGy DIFF Special Instructions 50 8ST 488 7 24 9 vs 7 279 Use this calibration factor for surface dose measurements obtained using a 6 MV photon beam and where doses are expected to fall 302 8 0 93 Calibration Verification Status PASS within 15 and 300 coy NOTE Perform Daily reader OC Weekly Calibration Verification with a recently irradiated constancy OC nanoDot per protocol Measurements performed by Date Time Calibration Accepted by Medical Physicist Signature Date Time LANDAUER microStar Reader QA Program RESOURCE Calibrat
48. up period the actual test protocol takes less than 5 minutes to complete LANDAUER microStar Reader QA Program Daily QC Tests NANODOT READING REPRODUCIBILITY TEST SUPPORTED in v4 3 SOFTWARE USING REPEATABILITY TEST WINDOW Ba MicroStar Calculate Sensitivity Adjustment Factor Reading V Calibration Lser Admin Configuration 4 About k Import Export Hardware Test 1 Data Operations w Participant Reader Data Standard Measurement Process Dark Counts CAL Counts LED Counts pany oc Dosimeter Info Dosimeter Sensitivity 0097032562 Re d Number Dose cGy 301 462 Measurement Inform PMT Counts 228642 Dose 304 4587 Cal Factor Sensitivity x uar Notes Calibration Name Cal Use Type Repeatability Test Window HD_Cs137_01182 Therapy Hide Detail For help press 1 Exit Clear Close Connected Dosimeter type Dot 11440546 10 19 2012 69 LANDAUER I microStar Reader QA Program Monitoring Reader Performance Trends PERFORMANCE METRICS THAT SHOULD BE MONITORED OVER TIME FOR TRENDS 1 STANDARD MEASUREMENT RESULTS DAILY amp OTHER 2 DAILY CONSTANCY NANODOT OPTIONAL 3 CALIBRATION FACTORS BY ENERGY DOSE RANGE LANDAUER microStar Reader QA Program Example Monitoring Trends in Daily QC Readings PMT Count PMT Counts Response to
49. works EXPANDED SCHEMATIC VIEW OPTICAL CHAIN Additional Optical Beam Aperture 5 diam x k Ig t NN Source v P E C dm lt we h A A i Filter i Photomultiplier on Swing N OSL Light Dosimeter STIMULATION SPECTRA Guide Active pack centered at 532 nm green s u EMISSION SPECTRA Further details of filter specifications 4 mm diam Medical Physics Vol 34 No 12 December 2007 Centered at 420 nm blue LANDAUER PMT Output Signal to Counting Circuit PMT ELECTRONICS microStar Reader QA Program Characteristics of the MicroStar Reader How it works Trapped Electron Releases with Optical Stimulation Software compares Test Dosimeter Counts to Reference Dosimeter Counts CALIBRATION Computed Dose Estimate LANDAUER microStar Reader QA Program Characteristics of the MicroStar Reader How it works POLYNOMIAL FIT Dose Calculation Applications Environmental Occupational The signal from the test dosimeter is compared against that of calibration references that are independently verified and ideally NIST traceable For best results the test and reference dosimeters should be irradiated under comparable conditions radiation quality geometry relative to source and scattering conditions etc LANDAUER MI microStar Reader QA Program Characteristics of the MicroStar Read
50. y work LUMINESCENCE 27 CENTER RECOMBINATION VALENCE BAND LANDAUER microStar Reader QA Program Physics of Luminescent Dosimetry Irradiation CONDUCTION BAND Dosimetric Traps Luminescence Centers NCE LANDAUER microStar Reader QA Program Physics of Luminescent Dosimetry Thermal Stimulation CONDUCTION BAND 0 De Se Dosimetric Traps Luminescence Centers VALENCE BAND LANDAUER microStar Reader QA Program Physics of Luminescent Dosimetry Optical Stimulation CONDUCTION BAND Luminescence Centers ID lt lt lt lt VALENCE BAND LANDAUER microStar Reader QA Program Physics of Luminescent Dosimetry OSLD vs TLD Electron hole capture at Electron hole capture at site Dose Deposition site of dosimetric traps in of dosimetric traps in crystalline structure crystalline structure Readout Mechanism Optically Stimulated Thermally Stimulateo Luminescence Luminescence Very good to Excellent Very good Readout speed Fast Slow Re read capability Multiple re reads None single read only ional Operational overhead man T High hours equipment Requires very stringent procedural controls to achieve good results LANDAUER microStar Reader QA Program Physics of Luminescent Dosimetry Electron Transitions A Exposure Charge separation electron moves CONDUCTION from valence band to co

MicroStar Reader QA Program

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