A less than optimal PA axial cranium projection (Caldwell method) that requires the chin to be elevated to obtain optimal positioning will
A) demonstrate unequal distance from the lateral orbital margins to the lateral cranial cortices on both sides.
B) demonstrate the superior orbital fissures within the orbits.
C) demonstrate the petrous ridges and pyramids in the superior half of the orbits.
D) need the IOML to be aligned perpendicular to the IR.

Question

Quizplus · Accepted Answer

DFor the Caldwell method, elevating the chin (thus not aligning the orbitomeatal line (OML) properly) will result in the petrous ridges being projected into the superior half of the orbits (C) instead of just below or clear of the inferior orbital margin. Additionally, the correct positioning requires the infraorbitomeatal line (IOML) to be perpendicular to the image receptor (IR) for an optimal PA axial cranium projection (D), not the OML as implied when the chin is elevated.

A Less Than Optimal PA Axial Cranium Projection (Caldwell Method)