| Question 1: What consideration is most correct regarding selection of magnetic field strength for MR simulation? |
| Reference: | Task Group 284 Report: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance. Glide-Hurst et. al. |
| Choice A: | Higher magnetic field strength is always better than lower field strength |
| Choice B: | Lower magnetic field strength has greater distortion from patient-induced inhomogeneity |
| Choice C: | Increasing field strength improves SNR but at a financial and safety cost |
| Choice D: | Decreasing field strength increases spatial resolution |
| Choice E: | The optimal field strength for MR simulation is 0.35 Tesla |
| Question 2: What is most correct regarding shimming? |
| Reference: | Reference: Task Group 284 Report: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance. Glide-Hurst et. al. |
| Choice A: | Active shimming is the only available method to homogenize the B0 field during installation |
| Choice B: | Passive shimming is adjusted for each patient to reduce distortion |
| Choice C: | Higher order active shimming is more important for lower magnetic field strengths |
| Choice D: | Active shimming reduces magnetic field heterogeneity for individual patients |
| Choice E: | Shimming requires a large variety of wood wedges |
| Question 3: Which is most correct about Level 2 personnel? |
| Reference: | Task Group 284 Report: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance. Glide-Hurst et. al. |
| Choice A: | They are older than Level 1 personnel |
| Choice B: | They are not allowed to be in Zone IV unless accompanied by Level 1 personnel |
| Choice C: | Their status is a promotion as a result of working for many years as level 1 personnel |
| Choice D: | They are critical to maintain MR safety in zones III and IV |
| Choice E: | They are critical to maintain MR safety in Zone I |
| Question 4: Which of the following does NOT reduce geometric distortion? |
| Reference: | Task Group 284 Report: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance. Glide-Hurst et. al. |
| Choice A: | Increase receiver bandwidth |
| Choice B: | Use GRE sequences in place of SE sequences |
| Choice C: | Scan tissue closer to the center of the bore |
| Choice D: | Apply GNL corrections |
| Choice E: | Use stitching to cover greater SI extents of anatomy |
| Question 5: What QA test is important to perform for radiation therapy applications and is not routinely done in the field of diagnostic imaging? |
| Reference: | AAPM TG 284: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance, 2021.
CPQR: Technical quality control guidelines for magnetic resonance imaging for radiation treatment planning (http://www.cpqr.ca/wp-content/uploads/2020/09/MRI-2020-05-01.pdf), 2020. |
| Choice A: | B0 homogeneity (slice or sphere uniformity phantom) |
| Choice B: | Signal to noise ratio |
| Choice C: | Central frequency stability |
| Choice D: | RF coils performance |
| Choice E: | Gradient non-linearity in a large field of view phantom |
| Question 6: Which test is NOT part of a typical acceptance/commissioning procedure post-MR system install? |
| Reference: | AAPM TG 100 Report: Acceptance testing and quality assurance procedures for magnetic resonance imaging facilities, 2010. |
| Choice A: | Magnetic fringe field mapping |
| Choice B: | Mechanical system checks |
| Choice C: | Emergency system checks |
| Choice D: | Vibration measurements |
| Choice E: | Transmitter and Gain Calibration |
| Question 7: What metric cannot be determined with a spherical homogeneity phantom of an arbitrary size? |
| Reference: | AAPM TG 100 Report: Acceptance testing and quality assurance procedures for magnetic resonance imaging facilities, 2010. |
| Choice A: | Signal to noise ratio |
| Choice B: | Central frequency stability |
| Choice C: | Image artifacts assessment |
| Choice D: | Geometric uncertainty |
| Choice E: | Slice position |
| Question 8: Which of the following is not a metal artifact reduction technique? |
| Reference: | AAPM TG 284: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance, 2021. |
| Choice A: | View angle tilting |
| Choice B: | Increased receiver bandwidth |
| Choice C: | Slice encoding metal artifact reduction |
| Choice D: | Intensity uniformity correction |
| Question 9: Geometric distortion due to gradient nonlinearity is |
| Reference: | AAPM TG 284: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance, 2021. |
| Choice A: | Partially corrected by vendor software |
| Choice B: | Increases with distance from isocenter |
| Choice C: | Partially corrected by Higher Order Shimming (HOS) |
| Choice D: | All of the above |
| Choice E: | A & B only |
| Question 10: When scanning patients for MR-SIM, hearing protection for patients is |
| Reference: | AAPM TG 284: Magnetic Resonance Imaging Simulation in Radiotherapy: Considerations for Clinical Implementation, Optimization, and Quality Assurance, 2021. |
| Choice A: | discouraged, because of the potential for artifact and distortion |
| Choice B: | unnecessary, since quiet MR acquisitions are used exclusively for simulation |
| Choice C: | required as with diagnostic MR examinations |
| Choice D: | optional depending on the gradient power of the system |
