| Question 1: What are linac beam scanning systems used for? |
| Reference: | Mayles, P. (Ed.), Nahum, A. (Ed.), Rosenwald, J. (Ed.). (2007). Handbook of Radiotherapy Physics. Boca Raton: CRC Press, https://doi.org/10.1201/9781420012026 |
| Choice A: | Linac acceptance testing |
| Choice B: | Linac and TPS commissioning |
| Choice C: | Annual QA |
| Choice D: | B&C |
| Question 2: What is the purpose of the reference mount in the beam scanning system? |
| Reference: | Das, I.J., Cheng, C.‐W., Watts, R.J., Ahnesjö, A., Gibbons, J., Li, X.A., Lowenstein, J., Mitra, R.K., Simon, W.E. and Zhu, T.C. (2008), Accelerator beam data commissioning equipment and procedures: Report of the TG‐106 of the Therapy Physics Committee of the AAPM. Med. Phys., 35: 4186-4215. doi:10.1118/1.2969070 |
| Choice A: | To remove fluctuations or drifts in beam output |
| Choice B: | Used as an example of how to mount your chamber in the scanning mount |
| Choice C: | To hold a back-up chamber in case the scanning chamber fails |
| Choice D: | For performing TG-51 clinical reference dosimetry measurements |
| Question 3: Which beam scanning tank setup error is evident in the following 6 MV profiles? |
| Reference: | Das, I.J., Cheng, C.‐W., Watts, R.J., Ahnesjö, A., Gibbons, J., Li, X.A., Lowenstein, J., Mitra, R.K., Simon, W.E. and Zhu, T.C. (2008), Accelerator beam data commissioning equipment and procedures: Report of the TG‐106 of the Therapy Physics Committee of the AAPM. Med. Phys., 35: 4186-4215. doi:10.1118/1.2969070 |
| Choice A: | Gantry tilt |
| Choice B: | Tank tilt |
| Choice C: | High scanning speed |
| Choice D: | None of the above |
| Question 4: Noisy scans are indicative of utilizing a scanning speed that's too fast. Under what conditions will these effects be the greatest? |
| Reference: | Das, I.J., Cheng, C.‐W., Watts, R.J., Ahnesjö, A., Gibbons, J., Li, X.A., Lowenstein, J., Mitra, R.K., Simon, W.E. and Zhu, T.C. (2008), Accelerator beam data commissioning equipment and procedures: Report of the TG‐106 of the Therapy Physics Committee of the AAPM. Med. Phys., 35: 4186-4215. doi:10.1118/1.2969070 |
| Choice A: | High energy electrons or small field sizes |
| Choice B: | High energy electrons or large field sizes |
| Choice C: | Low energy electrons or small field sizes |
| Choice D: | Low energy electrons or large field sizes |
| Question 5: What is the precision of modern water scanning systems? |
| Reference: | Saenz D, Roring J, Cruz W, Sarkar V, Papanikolaou N, Stathakis S. Commissioning and cross-comparison of four scanning water tanks. Int J Cancer Ther Oncol 2016; 4(1):415. DOI: 10.14319/ijcto.41.5 |
| Choice A: | 10 mm |
| Choice B: | 1 mm |
| Choice C: | 0.1 mm |
| Choice D: | 0.01 mm |
| Question 6: What scanning-tank component is critical to level prior to scanning? |
| Reference: | Mayles, P. (Ed.), Nahum, A. (Ed.), Rosenwald, J. (Ed.). (2007). Handbook of Radiotherapy Physics. Boca Raton: CRC Press, https://doi.org/10.1201/9781420012026 |
| Choice A: | Tank walls |
| Choice B: | Reference mount |
| Choice C: | Water surface |
| Choice D: | Scanning arm |
| Question 7: What is a 1D scanning tank particularly well suited to measuring? |
| Reference: | Knutson NC, Schmidt MC, Belley MD, et al. Equivalency of beam scan data collection using a 1D tank and automated couch movements to traditional 3D tank measurements. J Appl Clin Med Phys. 2018;19(6):60‐67. doi:10.1002/acm2.12444 |
| Choice A: | PDD |
| Choice B: | Lateral profiles |
| Choice C: | Diagonal profiles |
| Choice D: | Off axis ratios |
| Question 8: What scanning-tank characteristic is uniquely required for MRI-Linac applications? |
| Reference: | Chen, Xinfeng et al. “Measurement validation of treatment planning for a MR-Linac.” Journal of applied clinical medical physics vol. 20,7 (2019): 28-38. doi:10.1002/acm2.12651 |
| Choice A: | Radiation-resistant electronics |
| Choice B: | No ferromagnetic components |
| Choice C: | Light-weight |
| Choice D: | Precise electronics |
| Question 9: What is required for a scanning tank to be TG-51 compliant? |
| Reference: | Almond, P.R., Biggs, P.J., Coursey, B.M., Hanson, W.F., Huq, M.S., Nath, R. and Rogers, D.W.O. (1999), AAPM's TG‐51 protocol for clinical reference dosimetry of high‐energy photon and electron beams. Med. Phys., 26: 1847-1870. doi:10.1118/1.598691 |
| Choice A: | Dimensions of at least 30x30x30 cm |
| Choice B: | 3-dimensional scanning |
| Choice C: | PMMA walls |
| Choice D: | Walls no thicker than 0.2 mm |
| Question 10: What adaptation can be made to obtain commissioning data while maximizing cost effectiveness in a low-resource setting? |
| Reference: | Knutson, N.C., Schmidt, M.C., Belley, M.D., Nguyen, N., Price, M., Mutic, S., Sajo, E. and Li, H.H. (2018), Equivalency of beam scan data collection using a 1D tank and automated couch movements to traditional 3D tank measurements. J Appl Clin Med Phys, 19: 60-67. doi:10.1002/acm2.12444 |
| Choice A: | Take measurements in solid water instead of a water tank |
| Choice B: | Simply use the measurements provided by the linac vendor |
| Choice C: | Use a 1D scanning tank and couch shifts to achieve 3D scanning |
| Choice D: | Obtain a used 3D scanning tank then sell it once commissioning is complete |
