When performing a lateral L5-S1 projection, a positioning atlas recommends a 5° caudal angle with centering to a point 1½ inches inferior to iliac crest. After palpating the patient, you remove the caudal angle because the inter-iliac line is perpendicular with the image receptor. Where should the central ray enter when shifted to compensate for the removal of the angle?
A. 2 inches inferior to iliac crest
B. 
inches inferior to iliac crest
C. 1 inch inferior to iliac crest
D. 
inch inferior to iliac crest
Answer: C
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