For an AP axial cervical projection, the
1)mandibular angles, mastoid tips, and shoulders are positioned at equal distances from the IR.
2)central ray is angled 15 to 20 degrees cephalically.
3)OML is aligned perpendicular to the IR.
4)long axis of the cervical vertebra is aligned with the short axis of the collimated field.

1 and 2 only

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