The RPC s Evaluation of Advanced Technologies. AAPM Refresher Course July 29, 2008 Geoffrey S. Ibbott, Ph.D. and RPC Staff
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1 The RPC s Evaluation of Advanced Technologies AAPM Refresher Course July 29, 2008 Geoffrey S. Ibbott, Ph.D. and RPC Staff 1
2 Supported by: NCI grants CA10953 and CA81647, and an educational grant from Varian 2
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5 Brief Background Formed by agreement between AAPM and CRTS, with funding from NCI Founded in 1968 to monitor institution participation in clinical trials Funded continuously by NCI as structure of cooperative group programs have changed Now 38 years of experience of monitoring institutions and reporting findings to study groups and community 4 4
6 Mission The mission of the Radiological Physics Center is to assure NCI and the Cooperative Groups that institutions participating in clinical trials deliver prescribed radiation doses that are clinically comparable and consistent. We do this by assessing the institution s radiotherapy programs, helping the institutions implement remedial actions, assisting the study groups in developing protocols and QA procedures, and informing the community of our findings. 5
7 ITC IT (High tech Protocols) RTOG/ACR Only QA Office with relationships with all study groups QARC RPC RPC QA QA PROGRAM 6 ACOSOG COG SWOG CALGB ECOG NSABP NCCTG GOG ACRIN RTOG COMS CTSU NCI 6
8 ITC IT (High tech Protocols) RTOG/ACR Only QA Office with relationships with all study groups QARC RPC RPC QA QA PROGRAM 6 ACOSOG COG SWOG CALGB ECOG NSABP NCCTG GOG ACRIN RTOG COMS CTSU NCI 6
9 ATC ITC IT (High tech Protocols) RTOG/ACR Only QA Office with relationships with all study groups QARC RPC RPC QA QA PROGRAM 6 ACOSOG COG SWOG CALGB ECOG NSABP NCCTG GOG ACRIN RTOG COMS CTSU NCI 6
10 RPC s Conventional Monitoring Annual checks of machine output 1,532 institutions, 13,729 beams measured with TLD (2006) On-site dosimetry reviews 19 institutions visited (144 beams measured) Credentialing Phantoms, benchmarks, questionnaires, rapid reviews Treatment record reviews Review for GOG, NSABP, NCCTG, RTOG (brachy) Independent recalculation of patient dose Continue to find errors 7
11 RPC s Conventional Monitoring Annual checks of machine output 1,532 institutions, 13,729 beams measured with TLD (2006) On-site dosimetry reviews 19 institutions visited (144 beams measured) Credentialing Phantoms, benchmarks, questionnaires, rapid reviews Treatment record reviews Review for GOG, NSABP, NCCTG, RTOG (brachy) Independent recalculation of patient dose Continue to find errors 7
12 RPC s Conventional Monitoring Annual checks of machine output 1,532 institutions, 13,729 beams measured with TLD (2006) On-site dosimetry reviews 50 institutions visited (~150 accelerators measured) Credentialing Phantoms, benchmarks, questionnaires, rapid reviews Treatment record reviews Review for GOG, NSABP, NCCTG, RTOG (brachy) Independent recalculation of patient dose Continue to find errors 8
13 Visit Priority Chart Problem Other TLD Problem Patients Treated 9
14 On-Site Dosimetry Review Visit The only completely independent comprehensive radiotherapy quality audit in the USA and Canada Identify errors in dosimetry and QA program and suggest methods of improvements. Collect and verify dosimetry data needed to review patient charts. Improve quality of patient care for all patients
15 Selected discrepancies discovered during 2006 Errors Regarding: Percent of Institutions Review QA Program (84%) *Photon Depth Dose (30%) Switch to TG-51 (24%) *Wedge Transmission (24%) *Photon Calibration & FSD (24%) *Electron Calibration (22%) *Off-axis Factors (16%) *70% of institutions received at least one of the significant dosimetry recommendations
16 RPC s Conventional Monitoring Annual checks of machine output 1,532 institutions, 13,729 beams measured with TLD (2006) On-site dosimetry reviews 50 institutions visited (150 accelerators measured) Credentialing Phantoms, benchmarks, questionnaires, rapid reviews Treatment record reviews Review for GOG, NSABP, NCCTG, RTOG (brachy) Independent recalculation of patient dose Continue to find errors 12
17 Credentialing Why? Education Evaluate ability to deliver dose Improve understanding of protocol Reduce deviation rate 13 13
18 General Credentialing Process Previous patients treated with technique Facility Questionnaire Knowledge Assessment Questionnaire Benchmark case or phantom Electronic data submission RPC QA & dosimetry review Clinical review by radiation oncologist 14 14
19 General Credentialing Process Previous patients treated with technique Facility Questionnaire Knowledge Assessment Questionnaire Benchmark case or phantom Electronic data submission RPC QA & dosimetry review Feedback Clinical review by radiation oncologist to Institution 14 14
20 RPC Website Revisions 15
21 RPC Phantoms prostate IMRT: 8, incl. prosthesis thorax SBRT: 9 phantoms H&N IMRT: 31 in service SRS: 2 in service, others sent by RDS liver SBRT: 3, incl. motion 16
22 Number of phantom mailings 400 SRS Head Liver Prostate Lung H&N Phantoms Mailed Year Pattaya
23 IMRT Credentialing 500+ institutions have successfully irradiated an RPC IMRT or SBRT phantom 18
24 Scan, plan, and treat the phantom as if it were a patient 19 19
25 Treat the phantom like a patient Some institutions go overboard 20
26 Treat the phantom like a patient Some patients want to know more 20
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30 Phantom Results Comparison between institution s plan and delivered dose. Criteria for agreement: 7% or 4 mm DTA (or 5%/5mm) Site Technique Irradiations Acceptable irradiations Institutions acceptable H&N IMRT Pelvis IMRT Lung SBRT/ IMRT Liver SBRT Bench mark IMRT
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35 HN results grouped by accelerator manufacturer Linear Accelerator Manufacturer Pass Rate (%) Attempts Criteria Failed Dose DTA Dose and DTA BrainLab Elekta Siemens TomoTherapy Varian Total
36 HN results grouped by TPS Treatment planning system Pass Rate (%) Attempts Criteria Failed Dose DTA Dose and DTA Corvus Eclipse Pinnacle TomoTherapy XiO Other Total
37 HN results grouped by machine/tps Manufacturer/TPS Combination Pass Rate (%) Attempts Criteria Failed Dose DTA Dose and DTA Elekta/Corvus Elekta/Pinnacle Elekta/XiO Elekta/Other Siemens/Corvus Siemens/Pinnacle Siemens/XiO Siemens/Other Varian/Corvus Varian/Eclipse Varian/Pinnacle Varian/XiO Varian/Other Other Total
38 HN results grouped by technique IMRT technique Pass Rate (%) Attempts Criteria Failed Dose DTA Dose and DTA Dynamic MLC IMAT Segmental TomoTherapy Experimental Total
39 Pass Rate vs. Physicists RMAAPM - April 26,
40 Pass Rate vs. Machines RMAAPM - April 26,
41 Explanations for Failures Explanation Minimum # of occurrences incorrect output factors in TPS 1 incorrect PDD in TPS 1 IMRT Technique 3 Software error 1 inadequacies in beam modeling at leaf ends (Cadman, et al; PMB 2002) 14 QA procedures 3 errors in couch indexing with Peacock system 3 equipment performance 2 setup errors 7 RMAAPM - April 26,
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43 Acrylic PTV Esophagus PT polystyrene Bone Solid water 34 34
44 Convolution R-L Profile 35 35
45 Pencil-Beam profile 36 36
46 2D Gamma Index Evaluation Good Irradiation 37
47 2D Gamma Index Evaluation Good Irradiation 37
48 2D Gamma Index Evaluation Good Irradiation 37
49 2D Gamma Index Evaluation Good Irradiation 38
50 2D Gamma Index Evaluation Good Irradiation 38
51 2D Gamma Index Evaluation Good Irradiation 38
52 2D Gamma Index Evaluation Good Irradiation 38
53 2D Gamma Index Evaluation Good Irradiation 38
54 2D Gamma Index Evaluation Good Irradiation 38
55 2D Gamma Index Evaluation Failing Irradiation 39
56 Evaluation Criteria: 5% / 5 mm over PTV Percent of pixels passing: 90% - Axial 80% - Coronal 80% - Sagittal 40
57 Results Systems with good algorithms, passing original criteria: 25/29 irradiations passed 2D Gamma Index Systems with poor algorithms, passing original criteria: 3/18 irradiations passed 2D Gamma Index 41
58 Results of Credentialing (closed studies) Study Major Deviations Minor Deviations Number of Patients GOG 165 HDR Cervix Credentialed inst RTOG HDR & LDR Breast (all) RTOG 0019 LDR Prostate (values for dose only) reviewed (total 129 eligible) 42 42
59 Results of Credentialing (closed studies) Study Major Deviations Minor Deviations Number of Patients GOG 165 HDR Cervix Credentialed inst Non-credentialed RTOG HDR & LDR Breast (all) RTOG 0019 LDR Prostate (values for dose only) reviewed (total 129 eligible) 43 43
60 0413 / B-39 Reviews Review Type Number PBI 1566 WBI 1572 Patients with completed reviews 1085 Rapid Reviews 337 Timely Reviews 565 Open Reviews 145 Random Reviews 38 DVA Scores Per Protocol 924 Minor corrections 157 Major corrections 3 Repeat Timely Reviews 1 44
61 0413 / B-39 Reviews Review Type Number PBI 1566 WBI 1572 Patients with completed reviews 1085 Rapid Reviews 337 Timely Reviews 565 Open Reviews 145 Random Reviews 38 DVA Scores Per Protocol 924 Minor corrections 157 Major corrections 3 Repeat Timely Reviews 1 45
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68 G2 250 MeV 10 cm SOBP Depth Dose Depth [mm] 52
69 Stopping power ratio Stopping power ratio E-01 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 53
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72 RPC Phantoms Pelvis (8) Thorax (9) H&N IMRT (30) SRS Pattaya Head 2008 (4) Liver (2) 56
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