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Related Experiment Videos

CT colonography: multiobserver diagnostic performance.

Elizabeth G McFarland1, Thomas K Pilgram, James A Brink

  • 1Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 S Kingshighway Blvd, St Louis, MO 63110, USA. mcfarlandb@mir.wustl.edu

Radiology
|November 1, 2002
PubMed
Summary

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Computed tomographic (CT) colonography effectively detects colorectal polyps 10 mm or larger in patients with increased polyp burden. Diagnostic performance and reader agreement were sufficient for these larger lesions, though less so for smaller polyps.

Area of Science:

  • Medical Imaging
  • Gastroenterology
  • Diagnostic Radiology

Background:

  • Colorectal cancer screening relies on accurate polyp detection.
  • Computed tomographic (CT) colonography is an alternative to conventional colonoscopy.
  • Evaluating CT colonography's diagnostic performance is crucial.

Purpose of the Study:

  • To assess multiobserver diagnostic performance for colorectal polyp detection using CT colonography.
  • To compare reader agreement in patients with increased polyp burden versus average-risk patients.
  • To establish colonoscopy as the reference standard.

Main Methods:

  • Prospective evaluation of 70 patients using spiral CT colonography and same-day colonoscopy.
  • Acquisition of supine and prone images with single-detector row CT.

Related Experiment Videos

  • Independent analysis by four radiologists using 2D multiplanar reformation and 3D volume rendering.

    • Main Results:

    • Pooled sensitivity for lesions ≥10 mm was 0.68, with 75% reader agreement per polyp.
    • Pooled sensitivity for patients with lesions ≥10 mm was 0.88, with 94% agreement per patient.
    • Optimal detection and agreement peaked for polyps approximately 10 mm in diameter.

    Conclusions:

    • Single-detector row CT colonography demonstrated sufficient diagnostic performance for detecting colorectal lesions ≥10 mm.
    • Interobserver agreement was adequate for larger polyps.
    • Performance and agreement were more variable for smaller colorectal polyps.