針對男性腰椎攝影AP axial L5-S1 projection，其中心射束（central ray, CR）之角度對位何者正確？
Acephalad 30°、CR to the level of the ASIS（anterior superior iliac spine）at the midline of the body正確答案
Bcephalad 15°、CR to the level of the iliac crest at the midline of the body
Ccaudad 30°、CR to the level of the ASIS（anterior superior iliac spine）at the midline of the body
Dcaudad 15°、CR to the level of the iliac crest at the midline of the body
答案與詳解
