BTC Treatment Planning & Management 2 — Questions and Answers
Question 1: Which document must a biomedical technician review before servicing a radiation therapy linear accelerator to ensure patient treatment is not compromised?
- Equipment service history log
- Scheduled maintenance calendar
- Treatment planning system (TPS) output data
- Daily QA checklist and baseline tolerances (Correct answer)
Correct answer: Daily QA checklist and baseline tolerances
Daily QA checklists and baseline tolerances establish the performance standards that must be met before the machine is cleared for patient treatments.
Question 2: A biomedical technician is calibrating an infusion pump used in chemotherapy. The pump delivers 5% more volume than programmed. What is the appropriate action?
- Document the deviation and continue using the pump
- Remove the pump from service and recalibrate per manufacturer specs (Correct answer)
- Adjust the clinical dose to compensate for the error
- Notify the pharmacy and allow continued use at reduced settings
Correct answer: Remove the pump from service and recalibrate per manufacturer specs
Any pump with a delivery error exceeding acceptable tolerance must be removed from service and recalibrated before returning to patient use.
Question 3: Which standard body publishes guidelines for the performance and safety of medical electrical equipment used in treatment planning?
- OSHA
- IEC (International Electrotechnical Commission) (Correct answer)
- EPA
- CDC
Correct answer: IEC (International Electrotechnical Commission)
The IEC, specifically IEC 60601, provides internationally recognized safety and performance standards for medical electrical equipment.
Question 4: When managing a biomedical equipment inventory for a treatment facility, which metric is most critical for predicting preventive maintenance schedules?
- Purchase date of the device
- Mean Time Between Failures (MTBF) (Correct answer)
- Number of clinical staff using the device
- Cost of replacement parts
Correct answer: Mean Time Between Failures (MTBF)
MTBF quantifies the average operational time between failures, making it the key metric for scheduling preventive maintenance intervals.
Question 5: A hospital plans to upgrade its treatment planning software. Which biomedical technician task is essential before the new system goes live?
- Verifying staff have completed software training
- End-to-end validation testing against known clinical benchmarks (Correct answer)
- Ordering replacement hardware components
- Notifying insurance carriers of the software change
Correct answer: End-to-end validation testing against known clinical benchmarks
End-to-end validation testing ensures the new TPS produces clinically accurate results before it is used for actual patient treatment plans.
Question 6: In a radiation oncology department, who bears primary responsibility for verifying that treatment machine output matches the prescribed dose in the treatment plan?
- The treating radiation therapist
- The medical physicist (Correct answer)
- The biomedical equipment technician
- The radiation oncologist
Correct answer: The medical physicist
The medical physicist is primarily responsible for verifying machine output calibration against prescribed doses, though biomedical technicians support equipment readiness.
Question 7: A biomedical technician discovers that the interlock system on a radiation therapy machine failed to activate during a simulated fault condition. What is the correct response?
- Log the finding and schedule repair at the next maintenance window
- Immediately remove the machine from service until the interlock is repaired (Correct answer)
- Manually monitor patients during treatment until parts arrive
- Notify staff to avoid triggering the fault condition
Correct answer: Immediately remove the machine from service until the interlock is repaired
A failed interlock is a critical safety system failure requiring the machine to be immediately taken out of service to prevent patient harm.
BTC Treatment Planning & Management 2
Which document must a biomedical technician review before servicing a radiation therapy linear accelerator to ensure patient treatment is not compromised?