Virtual colonoscopy or CT colonography is a procedure in which a radiologist uses x-rays and a computer to create images of your rectum and colon from outside the body. Virtual colonoscopy can show ulcers, polyps, and cancer (colorectal cancer).
Using a CT scanner and computer methods of reconstructing the images, the colon can be evaluated without a colonoscope and without sedation.
Virtual colonoscopy takes the information produced by a CT scanner and processes this information to produce an image of the colon’s inner surface. When the colon is properly cleansed and expanded (distended) with room air or carbon dioxide, and when the CT information is processed, our experienced radiologists can look at the inner lining or surface to detect polyps, ulcers or cancers. The procedure lasts about 10 to 15 minutes.