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Related Experiment Videos

CT colonography: single- versus multi-detector row imaging.

A K Hara1, C D Johnson, R L MacCarty

  • 1Department of Diagnostic Radiology, Mallinckrodt Institute of Radiology, 510 S Kingshighway Blvd, St Louis, MO 63110, USA. haraa2@yahoo.com

Radiology
|April 27, 2001
PubMed
Summary

Multi-detector row CT significantly improves colonic distention and reduces respiratory artifacts during computed tomographic (CT) colonography compared to single-detector row CT. Polyp detection rates for larger polyps were similar between the two CT systems.

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Area of Science:

  • Medical Imaging
  • Gastroenterology
  • Radiology

Background:

  • Computed tomographic (CT) colonography is an emerging tool for colorectal cancer screening.
  • The quality of CT colonography can be affected by factors such as colonic distention and respiratory motion artifacts.
  • Advancements in CT technology, specifically multi-detector row CT (MDCT), may offer improvements over single-detector row CT (SDCT).

Purpose of the Study:

  • To compare the effectiveness of single-detector row CT (SDCT) and multi-detector row CT (MDCT) in computed tomographic (CT) colonography.
  • To evaluate differences in colonic distention, respiratory artifacts, and polyp detection between SDCT and MDCT systems.

Main Methods:

  • A prospective study involving 237 patients undergoing CT colonography.

Related Experiment Videos

  • Patients received glucagon and underwent prone and supine CT colonography using either SDCT (n=77) or MDCT (n=160).
  • Colonic distention, respiratory artifacts, and polyp depiction were independently assessed by two radiologists, with colonoscopy as the reference standard.

    • Main Results:

    • MDCT demonstrated significantly better colonic distention (19% suboptimal) compared to SDCT (52% suboptimal) (P <.001).
    • Respiratory artifacts were significantly reduced with MDCT (16%) compared to SDCT (61%) (P <.001).
    • Polyp detection for lesions larger than 10 mm showed no significant difference between MDCT (80%) and SDCT (89%) (P >.05).

    Conclusions:

    • Multi-detector row CT significantly enhances colonic distention and reduces respiratory artifacts in CT colonography compared to single-detector row CT.
    • Current data suggest no significant difference in detecting larger polyps (>10 mm) between SDCT and MDCT.
    • Further studies with a higher prevalence of clinically significant polyps are warranted to fully assess polyp detection differences.