| Question 1: What is the preferred method for collection of TMR data. |
| Reference: | N. C. Knutson et al., “Technical Note: Direct Measurement of Continuous TMR Data with a 1D Tank and Automated Couch Movements,†Med. Phys., vol. 44 no. 7 pp. 3861-3865, |
| Choice A: | Conversion from measured PDDs |
| Choice B: | Discrete measurements in solid water |
| Choice C: | Direct continuous measurement in water |
| Choice D: | I don’t measure TMRs because it is too hard |
| Question 2: Scanning speeds are limited by all but the following. |
| Reference: | N. C. Knutson et al., “A Cost Effective Method for Collecting Commissioning Beam Scan Data with a 1D Tank and Automated Couch Movements,†JACMP vol 19 no. 6 pp. 60-67, 2018. |
| Choice A: | Water motion |
| Choice B: | Data point resolution |
| Choice C: | Maximum couch speed |
| Question 3: How do you program a beam hold in a developer mode research beam |
| Reference: | N. C. Knutson et al., “A Cost Effective Method for Collecting Commissioning Beam Scan Data with a 1D Tank and Automated Couch Movements,†JACMP vol 19 no. 6 pp. 60-67, 2018. |
| Choice A: | Set the MU to zero |
| Choice B: | Change MU from control point to control point |
| Choice C: | Modify a machine parameter with a fixed MU |
| Choice D: | Type “Pause†in XML |
| Question 4: Beam alignment and profile measurements in the presence of a magnetic field is primarily affected by |
| Reference: | van Zijp et al. “Minimizing the magnetic field effect in MR-linac specific QA-tests: the use of electron dense materialsâ€, PMB 2016,61(3) |
| Choice A: | The change in dose distribution due to the B-field effect on the secondary electrons |
| Choice B: | The change in dose reading due to the B-field effect on the detector |
| Choice C: | The change in dose output due to the B-field effect on the linac |
| Choice D: | B-field inhomogeneity within the bore. |
| Question 5: Setup of measurement equipment and beam alignment measurement on a MRI-Linac cannot make use of: |
| Reference: | Barten et al., “Suitability of EBT3 GafChromic film for quality assurance in MR-guided radiotherapy at 0.35 T with and without real-time MR imaging†PMB 2018 63(16); |
| Choice A: | Projections of the radiation field |
| Choice B: | Gantry rotation |
| Choice C: | Collimator rotation |
| Choice D: | Position (difference) of well-defined objects (e.g. ball-bearings) |
| Question 6: Detector response curves to e.g. dose should at least be: |
| Reference: | Raaymakers et al. “First patients treated with a 1.5 T MRI-Linac: clinical proof of concept of a high-precision, highfield MRI guided radiotherapy treatmentâ€, PMB 2017 62 (41) |
| Choice A: | Linear |
| Choice B: | Accurately determined |
| Choice C: | Not influenced by the magnetic field |
| Choice D: | All of the above |
