ARRT Head and Neck Procedures 2

Question 1

Which projection of the skull best demonstrates the petrous ridges in the lower third of the orbits?

Accepted Answer

PA Caldwell (15°)

Answer

The PA Caldwell projection with 15° caudal angulation projects the petrous ridges into the lower third of the orbits.

Question 2

For a parietoacanthial (Waters) projection, the OML forms what angle with the image receptor?

Accepted Answer

37°

Answer

In the Waters projection, the OML is angled 37° from the plane of the image receptor to project the petrous ridges below the maxillary sinuses.

Question 3

The SMV (submentovertex) projection is primarily used to demonstrate which structures?

Accepted Answer

Zygomatic arches and base of skull

Answer

The SMV projection demonstrates the zygomatic arches, base of skull, sphenoid sinuses, and mandibular condyles.

Question 4

On a lateral cervical spine radiograph, which landmark is used to ensure the image includes C7?

Accepted Answer

Visualization of the C7-T1 interspace

Answer

The C7-T1 interspace must be visualized on a lateral cervical spine image to ensure complete coverage of all cervical vertebrae.

Question 5

Which sinus is best demonstrated on the PA Caldwell projection?

Accepted Answer

Frontal sinus

Answer

The PA Caldwell projection with 15° caudal tilt best demonstrates the frontal sinuses and anterior ethmoid air cells.

ARRT - American Registry of Radiologic Technologists Practice Test