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Verification of Practice: Maximum safety and minimum risk for patient

Learn about ACDS's external dosimetric verification service for radiotherapy centers, ensuring treatment accuracy. Discover the program's structure and auditing process. Dr. Ivan Williams leads a team of experts.

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Verification of Practice: Maximum safety and minimum risk for patient

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  1. Verification of Practice:Maximum safety and minimum risk for patient Beyond Bricks and Mortar 11/08/2011 Dr Ivan Williams Director ACDS

  2. Congratulations! You have a new centre/machine It is now opened The ribbon is cut A crowd gathered The press took photos And now they have gone It’s time to get to work and treat.

  3. Question How do you know that your metrics: Weight / Rate / Volume / Amount / Dose / Dose-rate / Energy/ Positioning / Imaging / Distortion / Data transfer / etc etc Are correct?

  4. Internal QA/QC programs Quality Control Quality Assurance

  5. But: generic cause number of accidents Calibration and use of radiation 4 measurement system Commissioning/calibration of 15 treatment unit Commissioning and use of 11 treatment planning system

  6. Internal systemic errors 1045 patients

  7. ACDS: Rationale The number of patients and fields treated with therapeutic radiotherapy within Australia is increasing every year – population trends indicate that this demand will continue to increase There is convincing international evidence demonstrating that external, independent dosimetric verification of radiotherapy centres improves the accuracy of the treatment delivery.

  8. ACDS: Establishment I In July 2010, the Australian Government funded a trial initiative to provide external, independent dosimetric verification for Australian radiotherapy centres: The Australian Clinical Dosimetry Service, ACDS. The ACDS will be operated by ARPANSA, under a memorandum of understanding, MOU. The ACDS will be based at Yallambie, the radiation Primary Standards Laboratory, Melbourne, utilising the dosimetric expertise within.

  9. ACDS: Establishment II 3 Levels of free audit service to be developed in consultation with, and delivered to, the radiotherapy community over 3 years Analysis of the service will be conducted in the third year to determine the outcomes of the ACDS A decision will be made whether to continue, modify or terminate the program based on the outcomes i.e. continuation of the service is NOT a given

  10. ACDS: Staffing ACDS staff will consist of Director Appointed Dr Ivan Williams Consultant Appointed (0.2) A/Prof Tomas Kron Physicists 2 FTE Mr John Kenny (F/T  P/T) Dr Jessica Lye (P/T) Dr Joerg Lehmann (F/T) Administrative 0.5 FTE To be advertised in 2011

  11. ACDS: Structure I The MOU requires a Clinical Advisory Group, CAG, which will consult into the ACDS. The CAG will consist of individuals from the various stakeholders: RORIC Roger Allison (QLD) RO ACPSEM Romauld Gajewski (NSW) MP AIR Caroline Knipe (Tas.) RT RANZCR Chris Hamilton (Vic.) RO TROG Annette Haworth (Vic.) MP AAPROP Mathew Murray (QLD) MP

  12. ACDS: Structure II The MOU requires an auditing group drawn from the 3 professions to; • assist ACDS staff while reducing travel costs, • provide additional technical advice during site visits, • ensure site visits take place according to procedures, • assist the professional development of radiotherapy facility staff on the Audit Panel, • provide the profession with greater participation in the ACDS project, and • provide an informal path of feedback into the ACDS project.

  13. Audit designs Level II T.Kron et al., Int. J. Radiation Oncology Biol. Phys., Vol. 52, No. 2, pp. 566–579, 2002

  14. Level 1: OSLD An independent measurement of linear accelerator output at one point under reference conditions in a regular homogenous phantom

  15. Level2 An independent measurement of linear accelerator output at multiple points in multiple beams. The phantom will contain inhomogeneities and wedged fields will be investigated. IAEA Pub 1297, IAEA-TRS430, IAEA-TECDOC-1583, ESTRO Booklet No.7, IAEA-TECDOC-1543, Kron et al. (2002), Ebert et al. (2009)

  16. Level 3 An independent measurement for a specific treatment area. An anthropomorphic phantom section will be CT imaged, contoured, planned and treated following to a defined protocol.

  17. Level 3 IAEA-TECDOC-1583, ICRU 62.

  18. Reporting to the organisation Your Beam is 0.7 % high with a 2 x sigma of 4.2 %

  19. Risk Profile: Centre cf Auditor Auditor Infrequent Authority measurement Centre Frequent Normal Consequences of error are thus very different: False Positive & False Negative Mammo defn

  20. Minimise risk: ARPANSA

  21. Level 1: Results to date

  22. Level 1: By Linac

  23. To-date Formal launch Level I audits operational and planned to 2013 Level Ib direct calibrations operational. Mail out to centres for contacts (90+ % return) Website database development Staff arrived Level II and III draft protocols written – field testing arranged OSLD commissioning on-going

  24. Acknowledgements RamanathannGanesan Peter Harty David Webb Duncan Butler Chris Oliver Dave Webb John Kenny Leon Dunn Jessica Lye Tomas Kron Abel MacDonald Alison McWhirter Tracey Rumble

  25. Standards Lab I

  26. Standards Lab II Courtesy R.Ganesan, P Harty.

  27. Standards Lab III Courtesy R.Ganesan, P Harty.

  28. Radiological Physics Centre 5% – 6% of US megavoltage beams > ±5% (TLD) 125/537 (22%) US institutions fail to meet irradiation criteria with anthropomorphic phantoms

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