Question

When performing the parietoacanthial projection of the facial bones, which of the following is the correct patient position and exit point for the central ray (CR)?

1) OML perpendicular to the IR with the CR exiting at the acanthion
2) MML perpendicular to the IR with the CR exiting at the acanthion
3) LML perpendicular to the IR with the CR exiting at the acanthion
4) OML perpendicular to the IR with the CR exiting at the nasion

Answer 1

The correct patient position for the parietoacanthial projection of the facial bones is with the OML perpendicular to the IR and the CR exiting at the acanthion.

Step-by-step explanation:

When performing the parietoacanthial projection of the facial bones, the correct patient position and exit point for the central ray (CR) is Option 1: The OML (Orbitomeatal Line) should be perpendicular to the IR (Image Receptor) with the CR exiting at the acanthion. The acanthion is a landmark on the skull that corresponds to the notch at the top of the upper lip, just below the nose, where the CR is directed for this type of projection. Ensuring proper patient positioning and alignment of the CR is critical for obtaining an accurate radiographic image of the facial bones, which includes the orbit and hard palate.