Medical physics certification Medical Physics - Board Exam Part 1 - Radiation Therapy | 109 Questions a nd Answers with Complete Solutions 100% Correct | Lat est Update 202 4 PDD is dependent on the following factors - Answer Increases with beam energy Increases with field size Increases with SSD Decreases with Depth TAR is dependent on the following factors - Answer Increases with beam energy Increases with field size Decreases with depth Independent of SSD Skin dose is dependent on the following factors - Answer Decreases with beam energy Increases with SSD Increases with field size Increases with bolus Increases with oblique incidence The indicated field size on a medical LINAC represents the field length and width in centimeters as defined at the: - Answer At isocenter (100 cm) On a conventional simulator, localizing lasers and ODI checks should be performed when and within what tolerance - Answer Daily, 2mm What is the tolerance for light/radiation field coincidence? - Answer 2mm Photon Dmax (cm) - Co60 - Answer 0.5 Photon Dmax (cm) - 4MV - Answer 1.0 Medical physics certification Photon Dmax (cm) - 6MV - Answer 1.5 Photon Dmax (cm) - 10MV - Answer 2.7 Photon Dmax (cm) - 15MV - Answer 3.0 Photon Dmax (cm) - 18MV - Answer 3.2 Photon Dmax (cm) - 20MV - Answer 3.5 Photon Dmax (cm) - 25MV - Answer 4.0 Electron Dmax (cm) - 6MeV - Answer 1.5 Electron Dmax (cm) - 9MeV - Answer 2.2 Electron Dmax (cm) - 10MeV - Answer 2.5 Electron Dmax (cm) - 12MeV - Answer 2.8 Electron Dmax (cm) - 15MeV - Answer 2.9 Electron Dmax (cm) - 18MeV - Answer 3.2 GTV - Answer Gross Tumor Volume CTV - Answer Clinical Target Volume = GTV + margin for microscopic spread ITV - Answer Internal Target Volume = CTV + Internal margin PTV - Answer Planning Target Volume = ITV + Setup margin PRV - Answer Planning Risk Volume = defined as the OAR plus a margin to account for patient movement and setup uncertainties
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