An AP axial cranial projection (Towne method) with accurate positioning demonstrates
1)equal distances from the posterior clinoid processes to the lateral borders of the foramen magnum on each side.
2)the midsagittal plane perpendicular to the IR.
3)the dorsum sellae within the foramen magnum.
4)the posterior clinoids inferior to the foramen magnum.
A) 1, 2, and 3 only
B) 1 and 3 only
C) 2 and 4 only
D) 1, 2, 3, and 4

Question

Quizplus · Accepted Answer

The AP axial cranial projection (Towne method) aims to accurately visualize the structures of the posterior cranial fossa. When performed correctly, it should show equal distances from the posterior clinoid processes to the lateral borders of the foramen magnum on each side, indicating that the head is not rotated. The midsagittal plane should be perpendicular to the image receptor (IR), ensuring that the projection is not angled improperly. Additionally, the dorsum sellae should be visible within the foramen magnum, which is a key indicator of correct angulation and positioning. The statement about the posterior clinoids being inferior to the foramen magnum is incorrect and not a goal of this projection.

An AP Axial Cranial Projection (Towne Method) with Accurate Positioning