| Question 1: What distinguishes the Leksell Gamma Knife for other teletherapy devices? |
| Reference: | Leksell Gamm Knife Perfexion and Leksell Gamma Knife Icon Licensing Guidance Revision 1, Jan 10 2019, USNRC. |
| Choice A: | Dedicated intracranial stereotactic radiosurgery device |
| Choice B: | Utilizes gamma radiation from cobalt-60 |
| Choice C: | Requires special training and licensing |
| Choice D: | All of the above |
| Question 2: What field size is specified for dose calibration of the Leksell Gamma Knife? |
| Reference: | Drzymala et al, Med Phys 35(2), 514, February 2008 |
| Choice A: | 10 b 10 cm2 |
| Choice B: | Varies with model |
| Choice C: | 1.6 cm2 diameter |
| Choice D: | (b) and (c) above |
| Question 3: What is the criteria for the dose comparison within the target of the IROC Houston’s SRS phantom? |
| Reference: | Mehrens et al. Evaluation of trends and performance indicators for IROC Houston’ SRS Head phantom. AAPM ePoster Library AAPM 2020 |
| Choice A: | 0.97 - 1.03 |
| Choice B: | 0.95 - 1.05 |
| Choice C: | 0.93 - 1.07 |
| Choice D: | 0.95 - 1.07 |
| Question 4: What type of detector uses the IROC Houston QA office for the output check service offered for Gamma Knife unit? |
| Reference: | Alvarez et al. Independent Remote Audits for TG51 NonCompliant Photon Beams Performed by the IROC Houston QA Center. Med Phys. 2016 May :43(6):3574-3574. |
| Choice A: | OSLD |
| Choice B: | TLD |
| Choice C: | Glass dosimeters |
| Choice D: | Alanine |
| Question 5: The accuracy of the IFMM on the Gamma Knife Icon is on the order of |
| Reference: | Reference: Knutson et al. Characterization and validation of an intra-fraction motion management system for masked-based radiosurgery. J Appl Clin Med Phys. 2019 May;20(5) 21-26. |
| Choice A: | 0.5 mm |
| Choice B: | 5 mm |
| Choice C: | 5 cm |
| Choice D: | 0.05 mm |
| Question 6: Should one expect it to be typical of a secondary calculation of the treatment time in Gamma Knife to be more than 10% different from TPS? |
| Reference: | Prusator et al. Evaluation of a new secondary dose calculation software for Gamma Knife radiosurgery. J Appl Clin Med Phys, 21: 95-102. |
| Choice A: | No |
| Choice B: | Yes |
