During a lower GI imaging procedure, which statement is true?

During a lower GI imaging procedure, which statement is true?

• A. It uses fluoroscopy to visualize the colon outline by contrast
• B. It uses ultrasound to image the colon
• C. It requires an MRI machine
• D. It relies on CT angiography

Answer: (A)

The key idea is that a lower GI imaging study visualizes the colon by filling it with radiopaque contrast and watching it in real-time with fluoroscopy. This allows the radiologist to see the outline of the colon as the contrast coats the mucosa, helping detect irregularities like strictures, diverticula, polyps, or ulcers. Ultrasound doesn’t reliably show the gas-filled colon lumen, MRI isn’t the standard for this exam, and CT angiography targets vessels rather than outlining the colon lumen. So fluoroscopy with contrast to outline the colon is the true approach.

The key idea is that a lower GI imaging study visualizes the colon by filling it with radiopaque contrast and watching it in real-time with fluoroscopy. This allows the radiologist to see the outline of the colon as the contrast coats the mucosa, helping detect irregularities like strictures, diverticula, polyps, or ulcers. Ultrasound doesn’t reliably show the gas-filled colon lumen, MRI isn’t the standard for this exam, and CT angiography targets vessels rather than outlining the colon lumen. So fluoroscopy with contrast to outline the colon is the true approach.