Which criteria indicates a properly positioned AP axial Townes method?
the dorsum sellae is projected within the foramen magnum
the dens is projected within the foramen magnum
the dorsum sellae is projected superior to the foramen magnum
the dorsum sellae is projected inferior to the foramen magnum
the dorsum sellae is projected within the foramen magnum
Rationale: A properly positioned AP axial Townes method is demonstrated when the dorsum sellae is projected within the foramen magnum. Correct positioning of the OML/IOML must be matched with the correct caudal tube angle 30/37 degrees in order to project the dorsum sellae within the foramen magnum. If a mismatch of the tube angle and the positioning line occurs, the dorsum sellae will not be projected correctly within the foramen magnum.
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