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Virtual colonoscopy (VC, also called CT colonography or CT pneumocolon) is the use of CT scanning or magnetic resonance imaging (MRI) to produce two- and three-dimensional images of the colon (large intestine), from the lowest part, the rectum, to the lower end of the small intestine, and to display the images on an electronic display device.
Traditional colonoscopy is the most comprehensive type of colorectal cancer screening, but noninvasive options have their advantages. ... (CT) colonography and/or a stool-based test.
A virtual colonoscopy is an alternative test that uses a CT scanner instead of a colonoscope. This may be a more suitable alternative for people who are unable to receive a colonoscopy.
The other screening tests include flexible sigmoidoscopy, double-contrast barium enema, computed tomographic (CT) colonography (virtual colonoscopy), guaiac-based fecal occult blood test (gFOBT), fecal immunochemical test (FIT), and multitarget stool DNA screening test (Cologuard). [20]
Virtual colonoscopy, also called computed tomography colonography (CTC) or CT colonography, is a noninvasive way to check for polyps and colon cancer tumors. If you need a colonoscopy, you may ...
For any suspected large bowel disease, colonoscopy is the investigation of choice because tissue sample can be taken for investigation. Virtual colonoscopy (also known as CT colonography) is another preferred investigation, provided that facilities and expertise are available.
In cases of suspected bowel leak or perforation, gastrointestinal fistula, interloop abscess or other fluid collection, oncologic staging and surveillance, and CT colonography, oral positive contrast is useful in delineating the lesions. [3] 1% dilute barium solution can be administered orally for bowel preparation for CT scan of the abdomen. [4]
CT scanning can perform a virtual colonoscopy with greater accuracy and less discomfort for the patient than a traditional colonoscopy. [143] [144] Virtual colonography is far more accurate than a barium enema for detection of tumors and uses a lower radiation dose. [145] CT is a moderate-to-high radiation diagnostic technique.
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