A parietocanthial facial bone projection (Waters method) demonstrating the petrous ridges within the maxillary sinuses
A) would have been obtained with the patient's chin elevated more than needed to align the acanthioparietal line perpendicular to the IR.
B) would have been obtained with the patient's chin insufficiently elevated to align the MML perpendicular to the IR.
C) will require a cephalic central ray angulation if the patient is unable to adjust the chin.
D) would have resulted if the projection was obtained with the patient's mouth open.

Question

Quizplus · Accepted Answer

The Waters method is a projection used to visualize the facial bones and sinuses. The patient's chin needs to be elevated to align the midsagittal plane (MML) perpendicular to the IR. A parietocanthial projection with insufficient chin elevation (Option B) will result in superimposition of the petrous ridges within the maxillary sinuses, obscuring the sinuses' visualization. Elevating the chin more than needed (Option A) will result in a distorted image with the petrous ridges below the maxillary sinuses. Cephalic central ray angulation would not be necessary unless the patient's anatomy requires modification. Shortening the exposure time to prevent motion artifacts would be a solution if the patient has difficulty adjusting their chin adequately (Option C). The patient's mouth should be closed during this projection (Option D).

A Parietocanthial Facial Bone Projection (Waters Method) Demonstrating the Petrous