Which of the following describes the central-ray centering point for the L5-S1 lateral projection?
A) 2 inches posterior to the ASIS
B) 3 inches posterior to the ASIS
C) 2 inches posterior to the ASIS and 1 $1 / 2$ inches below the iliac crest
D) 2 inches posterior to the ASIS and 2 inches below the iliac crest

Question

Quizplus · Accepted Answer

The central-ray centering point for the L5-S1 lateral projection is 2 inches posterior to the ASIS and 1 $1 / 2$ inches below the iliac crest. This is because this point corresponds to the level of the L5-S1 intervertebral space. The other options either do not take into account the level of the intervertebral space or are situated too far away from it.

Which of the Following Describes the Central-Ray Centering Point for the L5-S1