For a Parietoacanthial Sinus Projection (Waters Method), the

Multiple Choice

For a parietoacanthial sinus projection (Waters method) , the
1) patient is positioned upright to demonstrate air-fluid levels within the maxillary sinuses.
2) MML is aligned perpendicular to the IR.
3) central ray is centered to the acanthion.
4) OML is at a 37-degree angle with the central ray.

A) 1 and 4 only
B) 2 and 3 only
C) 1, 2, and 3 only
D) 1, 2, 3, and 4