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A virtual colonoscopy is a procedure that uses X-rays or magnetic resonance imaging to create images of the colon and the rectum, according to the National Institute of Diabetes and Digestive and Kidney Diseases. A virtu... More »

The disadvantages of virtual colonoscopy include the danger of missing small polyps, the inability to biopsy or remove polyps or other growths, the radiation used to make X-ray images and the dangers of colon inflation. ... More »

With a virtual colonoscopy, the patient completes a prescribed bowel cleansing procedure, drinks a contrast medium and reports to the hospital. A radiologist inflates the colon, and a table moves the patient into a tube ... More »

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During an upper gastrointestinal series, a patient stands or sits in front of an X-ray machine and swallows barium, says the National Institute of Diabetes and Digestive and Kidney Diseases. The barium swallow coats the ... More »

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