BE-Large Intestine
AP oblique (LPO & RPO) ((Do Both)) IR Size: 14x17 LW SID: 40"" Page #'s: 2:164,260	Positioning:   • Pt supine   • Pt rotated 35°-45°   • (Elevated flexure)   • (Use sponge behind back)	CR Entrance & Angle:   • _|_ 1-2"" lateral to MSP @ level of iliac crests   • Collimation:   • Best to Determine:   • LPO-Right colic (hepatic) flexure, Ascending colon, Sigmoid colon   • RPO-Left colic (hepatic) flexure, Descending colon	Eval Criteria:   • (Could see Scottie dogs to show good rotation (45°))   • Entire colon   • LPO Right or RPO Left colic flexure less SI or open compared with the AP projection   • LPO Ascending colon, cecum, and sigmoid colon; RPO descending colon
PA oblique (LAO & RAO) IR Size: 14x17 LW SID: 40"" Page #'s: 2:160,252	Positioning:   • Pt prone   • Pt rotated 35°-45°   • (Usually easier for pt. than AP ob)   • (Lower flexure)	CR Entrance & Angle:   • _|_ 1-2"" lateral to MSP @ level of iliac crests   • Collimation:   • Best to Determine:   • RAO-Right colic (hepatic) flexure, Ascending colon, Sigmoid colon   • LAO-Left colic (hepatic) flexure, Descending colon, Sigmoid colon	Eval Criteria:   • (Could see Scottie dogs to show good rotation (45°))   • Entire colon   • RAO Right or LAO Left colic flexure less SI or open compared with the PA projection   • RAO Ascending colon, cecum, and sigmoid colon; LAO descending colon
Lateral IR Size: 10x12 LW SID: 40"" Page #'s: 2:161,254	Positioning:   • (Ventral decub - commonly used instead)	CR Entrance & Angle:   • _|_ to MCP @ level of iliac crests   • Collimation:   • Best to Determine:   • Rectum, Distal sigmoid colon	Eval Criteria:   • Rectosigmoid area in the center of the radiograph   • No rotation of the patient   • SI hips and femora   • Superior portion of colon not included when the rectosigmoid region is the area of interest
Ventral Decubitus IR Size: 10x12 LW SID: 40"" Page #'s: 2:169	Positioning:   • See Lat	CR Entrance & Angle:   •   • Collimation:   •	Eval Criteria:
AP or PA (Lat Decub.) IR Size: 14x17 LW in grid holder SID: 40"" Page #'s: 2:167,262	Positioning:   • Lateral Decubitus with anterior or posterior surface against IR	CR Entrance & Angle:   • Horizontally (Cross table) & _|_ to MSP @ level of iliac crests   • Collimation:   • Best to Determine:   • Right Lat Decub-contrast filled colon, ""Up"" (medial) side of ascending colon & lateral side of descending colon (when inflated with air)   • Left Lat Decub-contrast filled colon, ""Up"" (medial) side of descending colon & lateral side of ascending colon (when inflated with air)	Eval Criteria:   • Area from the left colic flexure to the rectum   • No rotation of the patient, as evidenced by the ribs and pelvis   • For single-contrast examinations, adequate penetration of the barium; for double-contrast examinations, the airinflated portion of the colon is of primary importance and should not be overpenetrated
AP or PA oblique (upright) IR Size: x SID: Page #'s: 2:170,264	Positioning:   •	CR Entrance & Angle:   •   • Collimation:   •	Eval Criteria: