Which positioning line must be placed perpendicular to the plane of the IR for an AP projection of the upper airway?

Name: Which positioning line must be placed perpendicular to the plane of the IR for an AP projection of the upper airway?
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Question

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The Acanthiomeatal line (AML) must be placed perpendicular to the plane of the IR for an AP projection of the upper airway. This line is drawn from the acanthion (junction of the upper lip and nose) to the outer canthus of the eye and corresponds to the hard palate.

Which Positioning Line Must Be Placed Perpendicular to the Plane