Koren Smith Spring Clinical Meeting
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Koren Smith – Spring Clinical Meeting
SAM Questions for MPPG#8 – Linac QA
1) Which publication is NOT a reference for quality assurance tests for medical linear accelerators?
1. AAPM TG217, Radiation Dose from Airport Scanners, 2013
2. WHO, Quality Assurance in Radiotherapy, 1988
3. AAPM TG40, Comprehensive QA for Radiation Oncology, 1994
4. IAEA, Setting up a Radiotherapy Program: Clinical, Medical Physics, Radiation Protection and Safety Aspects, 2008
5. AAPM TG142, Quality Assurance of medical accelerators, 2009
Answer: (1) AAPM TG217, Radiation Dose from Airport Scanners, 2013
Reference:
World Health Organization, Quality Assurance in Radiotherapy, WHO, Geneva (1998)
G. J. Kutcher et al, “Comprehensive QA for radiation oncology: Report of AAPM Radiation Therapy Committee Task Group 40,” Med. Phys. 21, 581-618 (1994)
IAEA, Setting up a radiotherapy programme: clinical, medical physics, radiation protection and safety aspects, Austria, 2008
E. E. Klein et al, “Task Group 142 report: Quality assurance of medical accelerators” Med. Phys. 36 (9), 4197– 4212 (2009)
2) The ICRU recommends that the dose delivered to the patient be within what percentage of the prescribed dose?
1. ± 1%
2. ± 2%
3. ± 3%
4. ± 4%
5. ± 5%
Answer: (5) ±5%
Reference: Determination of absorbed dose in a patient irradiated by beams of x- or gamma-rays in radiotherapy procedures,” International Commission on Radiation Units and Measurement Bethesda Report 24, 1976. 3) Which technology is NOT covered under the recommended quality assurance tests in TG 142?
1. Multileaf Collimation (MLC)
2. IMRT with Simultaneous Gantry Movement (VMAT/RapidArc)
3. Asymmetric Jaws
4. Virtual Wedges
5. Conebeam CT (CBCT)
Answer: (2) IMRT with Simultaneous Gantry Movement (VMAT/RapidArc)
Reference: E. E. Klein et al, “Task Group 142 report: Quality assurance of medical accelerators” Med. Phys. 36 (9), 4197– 4212 (2009)
4) Who is ultimately responsible for a linear accelerator quality assurance program?
1. Medical Director
2. Practice Administrator
3. Qualified Medical Physicist
4. Chief Therapist
5. Service Engineer
Answer: (3) Qualified Medical Physicist
Reference: E. E. Klein et al, “Task Group 142 report: Quality assurance of medical accelerators” Med. Phys. 36 (9), 4197– 4212 (2009)
5) Which of the following is NOT a TG142 recommended Daily QA Test?
1. Collimator Size Indicator
2. Photon Beam Profile Constancy
3. X-Ray Output
4. Distance Indicator (ODI)
5. Door Interlock (Beam Off)
Answer: (2) Photon Beam Profile Constancy
Reference: E. E. Klein et al, “Task Group 142 report: Quality assurance of medical accelerators” Med. Phys. 36 (9), 4197– 4212 (2009)