A radiograph of an AP barium enema (BE) projection reveals poor visualization of the sigmoid due to excessive superimposition of the sigmoid colon and rectum.How can this area be better visualized on the repeat exposure?

Question

Quizplus · Accepted Answer

CAngling the central ray (CR) 30° to 40° cephalad with an AP projection helps separate the sigmoid colon from the rectum, improving visualization. Taking a PA projection with the patient in the left lateral decubitus position also helps in better visualizing the sigmoid by using gravity to separate the intestinal loops.

A Radiograph of an AP Barium Enema (BE) Projection Reveals