MULTIPLE CHOICE QUESTIONS

Multiple Choice

1. In Eclipse TPS, the structure set typically contains:

• A. Images only

• B. Dose distributions only

• C. Contours of target volumes and organs at risk

• D. Beam parameters

Multiple Choice

2. In Eclipse TPS, what is the primary purpose of the optimization process in IMRT treatment planning?

• A. To calculate the final monitor units (MUs) for each beam after planning is completed

• B. To adjust beamlet intensities to best meet clinical dose-volume objectives and constraints

• C. To evaluate the agreement between planned and delivered dose distributions using gamma index

• D. To iteratively modify fluence maps as part of the dose delivery process

Multiple Choice

3. In Sliding Window delivery for IMRT, which of the following statements is TRUE?

• A. MLC leaves remain static while the beam is on

• B. Only one parameter is changed at a time during delivery

• C. Leaf motion and dose delivery occur simultaneously

• D. Beam is turned off while leaves move across the field

Multiple Choice

4. What is the minimum requirement to begin IMRT optimization in Eclipse?

• A. An upper objective defined for all structures

• B. An intermediate dose calculation step

• C. A lower objective defined for at least one structure

• D. A completed DVH analysis

Multiple Choice

5. What is the purpose of performing beam warm-up in daily QA for linear accelerators?

• A. To test emergency beam shutdown systems

• B. To reset the system before dose calculation

• C. To heat the machine and stabilize the beam before patient treatment

• D. To align gantry and collimator to 0° automatically

Multiple Choice

6. What action must be taken before delivering electron beams during warm-up or QA?

• A. Increase gantry angle to 90°

• B. Use the MOSAIQ software

• C. Attach the applicator to the treatment head

• D. Reboot the treatment console

Multiple Choice

7. In the Gamma Index method used for EPID dose verification, which two main factors are evaluated?

• A. Dose rate and monitor unit

• B. Dose difference and distance to agreement

• C. SSD and collimator angle

• D. Beam quality and gantry speed

Multiple Choice

8. What is the main purpose of performing daily PET/CT calibration?

• A. To test the speed of image reconstruction software

• B. To reset the gantry and patient table to factory settings

• C. To ensure the PET/CT system is ready and accurate for patient scans

• D. To perform emergency system backup

Multiple Choice

9. Which radioactive source is used during the PET daily QA for calibration?

• A. Co-57 source

• B. Iodine-131 capsule

• C. Ge-68 phantom

• D. FDG dose vial

Multiple Choice

10. If all PET QA parameters (Coincidence Rate, Singles, Block Busy, Gain Change, etc.) appear green or yellow after scanning the phantom, what should the operator do next?

• A. Power off the scanner for reset

• B. Perform weekly calibration immediately

• C. Begin clinical patient scanning

• D. Repeat the QA scan just to confirm