1.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?
A.cephalad 30°、CR to the level of the ASIS(anterior superior iliac spine)at the
midline of the body
B.cephalad 15°、CR to the level of the iliac crest at the midline of the body
C.caudad 30°、CR to the level of the ASIS(anterior superior iliac spine) at the
midline of the body
D.caudad 15°、CR to the level of the iliac crest at the midline of the body