An AP axial sacral projection with accurate positioning demonstrates
1)the long axis of the median crest aligned with the long axis of the collimated field.
2)foreshortening of the first through fifth sacral segments.
3)the median sacral crest positioned closer to the right side.
4)the ischial spines equally demonstrated and aligned with the pelvic brim.
A) 1 and 2 only
B) 1 and 4 only
C) 2 and 3 only
D) 1, 2, and 4 only

Question

Quizplus · Accepted Answer

The long axis of the median crest should be aligned with the long axis of the collimated field for accurate positioning. The ischial spines should be equally demonstrated and aligned with the pelvic brim. Foreshortening of the first through fifth sacral segments is expected in an AP axial sacral projection. However, the median sacral crest should be positioned in the center and not closer to one side. Therefore, options 2 and 3 are incorrect. Choice B (1 and 4 only) includes the correct statements about alignment of the median crest and ischial spines.

An AP Axial Sacral Projection with Accurate Positioning Demonstrates