CAMRT Radiography Practice Exam

For a double contrast barium enema, what major advantage does it provide in detecting abnormalities?

1. Clear visualization of soft tissues

2. Enhanced detection of small polyps

3. Quick imaging time

4. Reduced exposure to radiation

The correct answer is: Enhanced detection of small polyps

The major advantage of using a double contrast barium enema lies in its ability to enhance the detection of small polyps within the colon. This imaging technique employs both barium and air, which creates a detailed contrast that allows for better visualization of the colonic mucosa. The coating of barium provides an opaque layer that highlights larger structures, while the addition of air introduces a clear space in the lumen where the barium has not adhered. This contrast difference is particularly beneficial for spotting small lesions such as polyps, which might otherwise be less visible with single contrast studies or other imaging modalities. This improved visualization is essential in the context of colorectal cancer screening, as detecting polyps early is crucial for effective intervention and prevention of cancer development. In summary, the dual contrast media employed in this procedure enables radiologists to better identify and evaluate smaller abnormalities that may be missed with less sophisticated imaging techniques.