Author Question: Which criteria indicates a properly positioned AP axial Townes method? the dorsum sellae is ... (Read 89 times)

ericka1 · **on:** Jul 17, 2018

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

Question 2

Which imaging method is described in the following description? The thoracic and lumbar spine are imaged with a block placed under the foot on the side that contains the convex curve.

Ferguson method
Stetcher method
Weight-bearing method
Grashey method

batool · **Reply #1 on:** Jul 17, 2018

Answer to Question 1

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.

Answer to Question 2

Ferguson method

Rationale: The Ferguson method evaluates the curvature of the thoracic and lumber spine. The patient is first imaged with a PA projection. The second PA projection places a block under the patient's foot on the side with the convex curve.