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[CT colonography --"virtual colonoscopy"--a current review].

A J Aschoff1, M S Juchems, C K Weber

  • 1Abt. für Röntgendiagnostik, Universitätsklinikum Ulm. andrik.aschoff@medizin.uni-ulm.de

Zeitschrift Fur Gastroenterologie
|October 28, 2004
PubMed
Summary

Computed tomography (CT) colonography shows high accuracy for detecting large polyps but struggles with small ones. It offers a viable alternative for incomplete optical colonoscopies and high-risk patients.

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Area of Science:

  • Radiology and Imaging
  • Gastroenterology
  • Medical Technology

Background:

  • Review of published data on CT colonography over the past decade.
  • Focus on technical and medical advancements in CT colonography.
  • Acknowledges MRI colonography but concentrates on CT aspects.

Purpose of the Study:

  • To review the development of CT colonography over the last 10 years.
  • To discuss technical factors influencing CT colonography performance.
  • To evaluate the medical utility of CT colonography for polyp detection.

Main Methods:

  • Review of published literature on CT colonography.
  • Explanation of technical evolution to Multi-detector-row-CT (MDCT).
  • Discussion of influencing factors: slice thickness, radiation dose, patient preparation, and post-processing.

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Main Results:

  • CT colonography demonstrates high sensitivity and specificity for polyps >= 1 cm.
  • High negative predictive value for detecting larger polyps.
  • Current limitations in detecting polyps < 5 mm.
  • Effective as an alternative for incomplete optical colonoscopies.
  • Suitable for high-risk patients unsuitable for conventional endoscopy.

Conclusions:

  • CT colonography is a valuable tool for colorectal polyp detection, particularly for larger lesions.
  • It serves as a crucial alternative in specific clinical scenarios.
  • Potential future role in colorectal cancer screening programs as an alternative to conventional endoscopy.