X-Ray Certification Patient Protection 5

Question 1

What is a stochastic radiation effect?

Accepted Answer

An effect where probability increases with dose but severity does not depend on dose

Answer

Stochastic effects (e.g., cancer induction) have a probability proportional to dose but their severity is independent of dose level, with no threshold.

Question 2

Proper collimation to the area of clinical interest reduces which type of radiation that contributes to patient dose and image fog?

Accepted Answer

Scatter radiation

Answer

Tight collimation reduces the volume of tissue irradiated, producing less Compton scatter, which both degrades image quality and adds dose to surrounding tissue.

Question 3

Which of the following is a deterministic (non-stochastic) radiation effect?

Accepted Answer

Radiation-induced cataracts of the lens

Answer

Radiation-induced cataracts are deterministic effects that occur above a threshold dose and whose severity increases with dose above that threshold.

Question 4

When using digital radiography, overexposure of the image receptor is a concern primarily because:

Accepted Answer

Digital post-processing can mask overexposure, leading to unnecessarily high patient dose

Answer

Digital systems can produce a diagnostic-looking image even with excessive exposure through post-processing, hiding overexposure and resulting in unnecessary patient dose.

Question 5

Which organization sets occupational and public radiation dose limits in the United States?

Accepted Answer

The National Council on Radiation Protection and Measurements (NCRP)

Answer

The NCRP issues recommendations for radiation protection, including occupational and public dose limits, which are adopted by regulatory agencies.

X-Ray Certification Practice Test

X-Ray Certification Practice Test

X-Ray Certification Patient Protection 5