| Question 1: For photon beam, which energy metric has the highest sensitivity to change in beam energy? |
| Reference: | Gao S, Balter P, Rose M, Simon W.A comparison of methods for monitoring photon beam energy constancy. J Appl Clin Med Phys. 2016;17(6):242–53. |
| Choice A: | PDD |
| Choice B: | Flatness |
| Choice C: | Off-axis ratio |
| Choice D: | All the same |
| Question 2: To evaluate the beam profiles acquired by the ICA, all measured profiles in which region were compared with the TPS calculations as recommended by MPPG5.a? |
| Reference: | Gao S, Netherton T, Chetvertkov MA, Li Y, Court LE, Simon, WE, Shi J, Balter PA. Acceptance and verification of the Halcyon-Eclipse linear accelerator-treatment planning system without 3D water scanning system. Journal of Applied Clinical Medical Physics 20(10):111-117, 2019. |
| Choice A: | High-dose region |
| Choice B: | Penumbra region |
| Choice C: | Low-dose tail region |
| Choice D: | All of the above |
| Question 3: During WF calibration, perturbation of the beam shape of 0.1% can lead to calibration errors of: |
| Reference: | Simon, T A, Simon, W E, Kahler, D, Li, J and Liu, C 2010 Wide field array calibration dependence on the stability of measured dose distributions Med. Phys. 37 7 3501-9 |
| Choice A: | 0.1% |
| Choice B: | 1.0% |
| Choice C: | 2.0% |
| Choice D: | Calibration is not affected |
| Question 4: Ionization chambers’ volume |
| Reference: | Kantz S, Troeller McDermott A, Söhn M, Reinhardt S, Belka C, Parodi K, Reiner M. Practical implications for the quality assurance of modulated radiation therapy techniques using point detector arrays. J Appl Clin Med hys. 2017 Nov;18(6):20-31 |
| Choice A: | Can cause wider dose gradients |
| Choice B: | Can cause lower output factors for small fields (<2cmx2cm) |
| Choice C: | Might not be able to detect small MLC leaf miscalibration |
| Choice D: | All of the above |
| Question 5: When steering beam using IC profiler, it is recommended using point difference symmetry metric and _____ mode in the software: |
| Reference: | Gao S, Balter PA, Benjamin Tran, Rose M, Simon WE. Quantification of beam steering with an ionization chamber Array. Journal of Applied Clinical Medical Physics 19:168-176, 2018. |
| Choice A: | Average Rate |
| Choice B: | Total Dose |
| Choice C: | Instantaneous Rate |
| Choice D: | Any one of the above |
| Question 6: Monitoring linac electron beam energy constancy with ion chamber array (ICA) and double wedge phantom, which one was used as the electron energy metric: |
| Reference: | Gao S, Chetvertkov MA, Simon, WE, Sadeghi, Balter PA. Monitoring linear accelerators electron beam energy constancy with a 2D ionization chamber array and double-wedge phantom. Journal of Applied Clinical Medical Physics 21(1):18-25, 2020 |
| Choice A: | R90 |
| Choice B: | R80 |
| Choice C: | R50 |
| Choice D: | Rp |
