a. The central ray is too lateral -- not all anatomy is included

b. The central ray is too medial -- not all anatomy is included

c. The central ray is correct, but the collimation is too narrow side-to-side (should be CW instead of LW)

d. The patient didn't drink enough CM.

a. CR is perpendicular to IR; at 15 or 30 minutes, center to about 2" above iliac crest; >30 minutes, center to ASIS.

b. CR is perpendicular to IR; at 15 or 30 minutes, center to about 2" above ASIS; >30 minutes, center to iliac crest.

c. CR is perpendicular to IR; at 15 or 30 minutes, center to about 2" above ASIS; >30 minutes, center to ASIS.

d. CR is perpendicular to IR; at 15 or 30 minutes, center to about 2" above iliac crest; >30 minutes, center to iliac crest.

a. Patient is prone (or supine if patient cannot lie in prone position) with a pillow for the head.

b. Align MSP to midline of IR.

c. Align MCP to midline of IR.

d. Place arms up beside head with legs extended and support provided under the ankles.

e. Ensure that no rotation occurs.

a. Entire small intestine is demonstrated on each radiograph, with the stomach included on the first 15-minute or 30-minute radiograph.

b. Entire stomach is demonstrated on each radiograph, with the small intestine included on the first 15-minute or 30-minute radiograph.

c. No rotation is present -- ala of the ilium and the lumbar vertebrae are symmetric.

d. Appropriate technique is employed to visualize the contrast-filled small intestine without overexposing the parts that are filled only partially with barium.