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

Multiple Choice

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.