Radiography Exam Radiography 3

Question 1

Which positioning term describes rotation of the forearm so the palm faces posteriorly?

Accepted Answer

Pronation

Answer

Pronation is the movement that rotates the forearm so the palm faces posteriorly (downward when arm is at side).

Question 2

The Waters projection (parietoacanthial) is primarily used to demonstrate which structures?

Accepted Answer

Maxillary sinuses

Answer

The Waters projection is the preferred view for demonstrating the maxillary sinuses with minimal superimposition of the petrous ridges.

Question 3

Which photon interaction is the PRIMARY source of scatter radiation in diagnostic radiography?

Accepted Answer

Compton scattering

Answer

Compton scattering is the dominant interaction at diagnostic energy ranges (60-120 kVp) and is the primary source of scatter radiation that degrades image quality.

Question 4

What is the recommended minimum source-to-skin distance (SSD) for mobile fluoroscopy units?

Accepted Answer

38 cm

Answer

The National Council on Radiation Protection (NCRP) recommends a minimum SSD of 38 cm (15 inches) for mobile fluoroscopy to limit skin dose.

Question 5

A radiograph shows the medial and lateral epicondyles superimposed. Which elbow projection was obtained?

Accepted Answer

Lateral

Answer

Superimposition of the medial and lateral epicondyles is the hallmark of a true lateral elbow projection.

Radiography Exam Practice Test

Radiography Exam Practice Test

Radiography Exam Radiography 3