Lower GI AP/PA right/left lateral decubitus

Question 1

• Why is a patient placed on a 2-3” decub sponge for this radiograph?

Answer 1

so patient doesnt sink into bed

Question 2

• What is the central ray location?

Answer 2

MSP, level of iliac crest

Question 3

• Where will the barium settle in the right lateral decubitus?

Answer 3

Lateral surface of ascending colon, medial surface for descending colon

Question 4

• Which side of each section of the colon will be best demonstrated in the right lateral decubitus?

Answer 4

medial surface of ascending colon, lateral of descending colon

Question 5

• Where will the barium settle in the left lateral decubitus?

Answer 5

Lateral surface of descending colon, medial of ascending colon

Question 6

• Which side of each section of the colon will be best demonstrated in the left lateral decubitus?

Answer 6

Medial of descending colon, lateral of ascending colon

Question 7

• How is the central ray in relation to the floor?

Answer 7

Parallel to floor