VIR Radiation Safety & Protection 3

Question 1

The SI unit of absorbed radiation dose, measuring energy deposited per unit mass of material, is the:

Accepted Answer

Gray (Gy)

Answer

Roentgen (R)

Answer

Rem

Answer

Sievert (Sv)

Question 2

Dose area product (DAP), also called kerma area product (KAP), is used in fluoroscopy to:

Accepted Answer

Estimate total radiation output by accounting for both dose and irradiated field size

Answer

Measure only the peak skin dose at the point of maximum exposure

Answer

Calculate the operator's effective dose directly without conversion factors

Answer

Monitor real-time operator exposure during the procedure

Question 3

Diagnostic reference levels (DRLs) for interventional fluoroscopic procedures are best described as:

Accepted Answer

Investigation levels that prompt technique review when doses consistently exceed them

Answer

Legally mandated maximum dose limits that cannot be exceeded under any circumstance

Answer

Minimum dose thresholds required to achieve adequate diagnostic image quality

Answer

Patient-specific dose thresholds calculated individually by a medical physicist

Question 4

Which fluoroscopic parameter adjustment directly reduces radiation dose to the patient per unit of fluoroscopy time?

Accepted Answer

Reducing the pulse rate in pulsed fluoroscopy

Answer

Increasing the number of DSA acquisition frames per second

Answer

Increasing source-to-image distance while keeping SID constant

Answer

Moving the X-ray tube closer to the patient

Question 5

At what approximate cumulative skin dose do transient erythema reactions begin to occur as a radiation deterministic effect?

Accepted Answer

2 Gy

Answer

0.2 Gy

Answer

10 Gy

Answer

25 Gy

Question 6

Which type of radiation effect has no dose threshold and increases in probability (but not severity) with increasing radiation dose?

Accepted Answer

Stochastic effects such as radiation-induced cancer

Answer

Radiation-induced cataracts

Answer

Acute radiation syndrome

Answer

Radiation-induced skin necrosis

Question 7

What is the primary purpose of a radiation dose management system (e.g., Dose, DoseWatch) in the VIR suite?

Accepted Answer

To track, analyze, and report patient radiation dose across all fluoroscopic procedures for quality improvement

Answer

To automatically terminate procedures when regulatory dose limits are exceeded

Answer

To calibrate fluoroscopy equipment and verify output accuracy daily

Answer

To provide real-time operator badge dose monitoring during active procedures