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Related Experiment Videos

CT colonography without cathartic preparation: feasibility study.

M R Callstrom1, C D Johnson, J G Fletcher

  • 1Department of Diagnostic Radiology, Mayo Clinic, 200 First St SW, Rochester, MN 55905, USA.

Radiology
|May 29, 2001
PubMed
Summary
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Optimal stool labeling for computed tomographic (CT) colonography requires a 48-hour preparation period with multiple doses of oral contrast material. This method enhances polyp detection sensitivity, approaching that of traditional colonoscopy.

Area of Science:

  • Medical Imaging
  • Gastroenterology
  • Radiology

Background:

  • Computed tomographic (CT) colonography is an emerging technique for colorectal polyp detection.
  • Effective stool labeling is crucial for accurate interpretation of CT colonography findings.
  • Unprepared colons present challenges for differentiating stool from polyps.

Purpose of the Study:

  • To assess different oral contrast material administration regimens for stool labeling in CT colonography.
  • To determine the sensitivity of contrast-labeled stool for detecting polyps.

Main Methods:

  • Fifty-six patients with suspected polyps underwent CT colonography after receiving varying doses and durations (24 or 48 hours) of oral contrast material.
  • Stool labeling effectiveness was evaluated using CT images.

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  • Colonoscopy served as the gold standard for polyp detection, with results compared to CT findings.

    • Main Results:

    • Stool labeling scores significantly improved with longer administration times and more doses, reaching 88% at 48 hours with seven doses.
    • Polyp detection sensitivity for lesions ≥1 cm reached 100% in groups with adequate stool labeling (e.g., 48 hours, seven doses).
    • Sensitivity for polyp detection in patients with adequate stool labeling approached that of prepared colons.

    Conclusions:

    • A 48-hour oral contrast administration period with multiple doses is necessary for effective stool labeling in CT colonography.
    • Adequate stool labeling improves polyp detection rates, making CT colonography a more reliable tool.
    • This technique offers a promising alternative for colorectal cancer screening.