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Automated polyp detection at CT colonography: feasibility assessment in a human population
R M Summers1, C D Johnson, L M Pusanik
1Diagnostic Radiology Department, Warren Grant Magnuson Clinical Center, National Institutes of Health, Bldg 10, Rm 1C660, 10 Center Dr, MSC 1182, Bethesda, MD 20892-1182, USA.
Radiology
|March 29, 2001
Summary
Automated detection of colonic polyps using computed tomographic (CT) colonography is feasible, especially for large polyps. Improving colonic distention enhances sensitivity, with potential for further gains using prone CT colonography.
Area of Science:
- Medical Imaging
- Gastroenterology
- Computer-Aided Diagnosis
Background:
- Colorectal cancer screening relies on detecting colonic polyps.
- Computed tomographic (CT) colonography offers a less invasive alternative to conventional colonoscopy.
- Automated polyp detection algorithms aim to improve efficiency and accuracy in CT colonography.
Purpose of the Study:
- To evaluate the feasibility of an automated computer algorithm for detecting colonic polyps.
- To optimize the algorithm's performance using various shape criteria and threshold settings.
- To compare the algorithm's accuracy against conventional colonoscopy.
Main Methods:
- Twenty patients with known polyps underwent CT colonography in the supine position.
- A shape-based algorithm was employed to identify protruding colonic masses.
- Nine shape criteria and three isosurface threshold settings were analyzed.
- Results were validated against same-day conventional colonoscopy.
Main Results:
- The algorithm achieved 64% sensitivity for polyps ≥10 mm, improving to 71% in well-distended segments.
- Performance decreased for smaller polyps (<10 mm) and poorly distended colonic segments.
- A mean of six false-positive sites per colon was reduced by 39% through CT attenuation analysis.
Conclusions:
- Automated detection of colonic polyps, particularly large ones, is a viable approach.
- Adequate colonic distention is crucial for maximizing detection sensitivity.
- Incorporating prone CT colonography may further enhance diagnostic accuracy.