Radiography Exam Patient Positioning & Procedures 2

Question 1

Which radiographic projection best demonstrates the interproximal spaces of the posterior teeth?

Accepted Answer

Bitewing

Answer

Bitewing radiographs are specifically designed to demonstrate the crowns and interproximal (contact) areas of both upper and lower posterior teeth simultaneously.

Question 2

For an AP projection of the pelvis, what is the correct positioning of the lower extremities to demonstrate the femoral necks without foreshortening?

Accepted Answer

Internally rotate feet 15–20 degrees

Answer

Internal rotation of the feet 15–20 degrees places the femoral necks parallel to the image receptor, eliminating foreshortening.

Question 3

Which projection of the skull best demonstrates the sella turcica in profile?

Accepted Answer

Lateral skull

Answer

The lateral skull projection places the sella turcica in true lateral profile, making it the best view for evaluating this structure.

Question 4

Which positioning line is used as a reference for the orbitomeatal line (OML)?

Accepted Answer

A line from the outer canthus of the eye to the EAM

Answer

The orbitomeatal line (OML) extends from the outer canthus (lateral corner) of the eye to the external auditory meatus (EAM).

Question 5

For an AP axial projection of the skull (Towne method), the central ray is angled caudally. What is the standard angle when the OML is perpendicular to the IR?

Accepted Answer

30 degrees

Answer

The Towne method uses a 30-degree caudal angle when the OML is perpendicular to the IR to project the occipital bone and dorsum sellae.

Radiography Exam Practice Test

Radiography Exam Practice Test

Radiography Exam Patient Positioning & Procedures 2