screening colonography
Non-invasive CT imaging method for colorectal cancer screening that provides detailed visualization of the entire colon.
Full Definition
Screening colonography, also known as CT colonography or virtual colonoscopy, is a non-invasive imaging technique that uses computed tomography to create detailed images of the entire colon and rectum for colorectal cancer screening purposes. The procedure requires bowel preparation similar to conventional colonoscopy but does not require sedation or insertion of a colonoscope. Computer software can generate two-dimensional cross-sectional images and three-dimensional reconstructions of the colon to identify polyps and masses. While colonography has high sensitivity for detecting large polyps and cancers, it requires conventional colonoscopy for tissue removal if abnormalities are found. The technique serves as an alternative screening option for patients who cannot undergo or refuse conventional colonoscopy.
Usage
Usage note: Hyphenate when used as compound modifier; distinguish from diagnostic colonography.
In Context
- "Screening colonography was offered to patients who declined conventional colonoscopy." — clinical protocol
- "The study compared detection rates between screening colonography and fecal testing methods." — comparative effectiveness research