A optimally positioned AP axial cranium projection (Towne method) demonstrates all the following except
a. the inferior occipital bone at the center of the exposure field.
b. symmetrical petrous ridges.
c. the dorsum sellae within the foramen magnum.
d. the posteror clinoids superior to the foramen magnum.
Question 2
An AP axial cranium projection (Towne method) demonstrating the dorsum sellae superimposing the atlas's posterior arch
a. was obtained with the patient's face rotated toward the right side.
b. will require the central ray angle to be adjusted caudally until it forms a 30-degree angle with the OML.
c. will require the patient's chin to be elevated to obtain an optimal projection.
d. will also demonstrate elongation of the dorsum sellae.
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