A patient positioned in a 45 degree posterior oblique for the cervical spine will require:
a 15 degree caudal tube angle
a perpendicular beam
a 15 degree cephalic tube angle
a 30 degree cephalic tube angle
a 15 degree cephalic tube angle
Rationale: The AP oblique projections will require a 15 degree cephalic tube angle to demonstrate the intervertebral foramina. The degree of rotation of 45 degrees is essential along with the added tube angle to match the slope of the vertebrae.
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