Question 1

An optimal PA cranium projection demonstrates all of the following except

Accepted Answer

A)  equal distance from the lateral orbital margins to the lateral cranial cortices on both sides. 
B)  anterior clinoids and dorsum sellae seen inferior to the ethmoid sinuses. 
C)  petrous ridges superimposing the supraorbital margins. 
D)  internal acoustic meatus visualized through the center of the orbits.

Question 2

An AP axial cranium projection (Towne method) demonstrating the dorsum sellae superimposing the atlas's posterior arch

Accepted Answer

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.

Question 3

A optimally positioned AP axial cranium projection (Towne method) demonstrates all of the following except

Accepted Answer

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 posterior clinoids superior to the foramen magnum.

Question 4

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.

Accepted Answer

A)  1, 2, and 3 only 
B)  1 and 3 only 
C)  2 and 4 only 
D)  1, 2, 3, and 4

Exam 11: Image Analysis of the Cranium

An optimal PA cranium projection demonstrates all of the following except

An AP axial cranium projection (Towne method) demonstrating the dorsum sellae superimposing the atlas's posterior arch

A optimally positioned AP axial cranium projection (Towne method) demonstrates all of the following except