A PA cranium projection demonstrating the petrous ridges superior to the supraorbital margins
A) was obtained with the patient's chin tucked more than the required amount.
B) was obtained with the OML perpendicular to the IR.
C) will also demonstrate the internal acoustic meatus.
D) will require the patient to increase the amount the chin is tucked to obtain an optimal image.

Question

Quizplus · Accepted Answer

When the petrous ridges are seen superior to the supraorbital margins in a PA cranium projection, it indicates that the patient's chin was tucked more than necessary. The correct positioning would have the petrous ridges filling the orbits or just below the supraorbital margin, depending on the specific projection desired.

A PA Cranium Projection Demonstrating the Petrous Ridges Superior to the Supraorbital