Question

For the parietoacanthial (Waters method) projection of the facial bones and sinuses, which positioning baseline forms a 37-degree angle to the IR?

a) OML
b) IOML
c) MML
d) AML

Answer 1

The parietoacanthial (Waters method) projection of the facial bones and sinuses forms a 37-degree angle to the IR with the OML.

Step-by-step explanation:

For the parietoacanthial (Waters method) projection of the facial bones and sinuses, the positioning baseline that forms a 37-degree angle to the IR is the OML (Orbitomeatal Line).

The OML is a line that connects the outer canthus of the eye (the lateral corner) to the lower margin of the ear canal. It is used as a reference line in radiography for positioning the patient's head.

By aligning the OML at a 37-degree angle to the imaging receptor (IR), the parietoacanthial projection provides a clear view of the facial bones and sinuses.