Virtual colonoscopies can be performed by the GI Division of Premier Medical Group.
Virtual colonoscopies can be performed by the GI Division of Premier Medical Group.
Virtual colonoscopy is a procedure used to look for signs of pre-cancerous growths (called polyps), cancer, and other diseases of the large intestine. Images of the large intestine are taken using computerized tomography (CT) scan. Sometimes, magnetic resonance imaging (MRI) may be used for this test. A radiologist views the images on a computer, which puts together an animated, three-dimensional view of the inside of the large intestine. These views are similar to views obtained by optical colonoscopy. These images can be manipulated to afford the radiologist a detailed view of the inside of the colon and rectum.
With a virtual colonoscopy, a small rubber catheter is inserted into the rectum; the colon is expanded by introducing puffs of air through this catheter. Usually the patient lies on his or her back while hundreds of images are collected. The entire procedure takes about 15 minutes, and the patient can return to normal activities immediately. Typically there are no side effects.
With a virtual colonoscopy, the doctor is able to not only identify polyps, but other organs within the abdominal and pelvic regions. Other serious conditions can be seen; with optical colonoscopy, the doctor is limited to the inside of the colon.
A virtual colonoscopy is considered negative if the doctor does not see any abnormalities. It is considered positive if the images disclose any polyps or other abnormal tissue in the colon. If the test is positive, your doctor may recommend a traditional or optical colonoscopy so samples of the abnormal tissue can be taken for biopsy or so the polyps can be removed and also analyzed.
With a virtual colonoscopy, the patient still needs to follow a special diet a day or two prior to the exam and take a laxative to cleanse the colon. The prep is similar to the prep used for optical colonoscopy.