MR colonography with barium-based fecal tagging: initial clinical experience

Area of Science:

• Medical Imaging
• Gastroenterology
• Diagnostic Radiology

Background:

• Colorectal lesions require accurate detection for timely intervention.
• Conventional colonoscopy necessitates bowel preparation, which can be burdensome for patients.
• Magnetic resonance (MR) colonography offers a non-invasive imaging modality for colonic evaluation.

Purpose of the Study:

• To evaluate the efficacy of fecal tagging with barium sulfate for MR colonography.
• To assess MR colonography's ability to detect colorectal lesions in patients with suspected abnormalities.
• To determine if barium tagging can obviate the need for bowel cleansing.

Main Methods:

• Twenty-four patients with suspected colonic lesions underwent MR colonography after ingesting barium sulfate.
• Barium sulfate was administered with meals starting 36 hours prior to the MR examination.
• MR colonography was performed with water infusion and intravenous gadobenate dimeglumine, followed by conventional colonoscopy for comparison.

Main Results:

• MR colonography detected 15 polyps (5-20 mm) and 10 carcinomas, all confirmed by conventional colonoscopy.
• The sensitivity of MR colonography was 89.3% for lesions and 91.7% for patients.
• Conventional colonoscopy identified three additional lesions smaller than 8 mm.

Conclusions:

• Barium-tagged MR colonography is an effective strategy for detecting colorectal lesions.
• This method successfully visualizes lesions exceeding 8 mm in diameter.
• Barium-tagged MR colonography eliminates the need for bowel cleansing.