For an AP oblique lumbar projection (RPO or LPO position), the
1. patient's thorax is rotated until the midcoronal plane is at a 45-degree angle with IR.
2. side of interest is positioned closer to the IR.
3. central ray is centered 2 inches (5 cm) medial to the elevated ASIS at a level 1.5 inches (4 cm) superior to the iliac crest.
4. long axis of the vertebral column is aligned with the short axis of the collimated field.
a. 1 and 3 only
b. 2 and 4 only
c. 1, 2, and 3 only
d. 1, 2, 3, and 4
C
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