Virtual colonoscopy is a test that combines a CAT (Computer Assisted Tomography) scanner, sophisticated image processing computers, with skilled radiologists to actually recreate and evaluate the inner surface of the colon. The CAT scanner provides the x-ray images, the image processing computers create the 3-D display for the final interpretation.
The Virtual Colonoscopy is a new method of imaging the entire colon that is simpler, faster, and less invasive than conventional colonoscopy. It requires no sedation. Virtual colonoscopy is ideal for those with family history of colon cancer, overweight or eat high fat diet, or those with recent change in bowel habits. 
A New England Journal of Medicine article (December, 2003) comparing virtual colonoscopy to conventional colonoscopy concluded that virtual colonoscopy is an accurate screening method for the detection of colorectal neoplasia in asymptomatic average-risk adults and compares favorably with optical colonoscopy in terms of the detection of clinically relevant lesions. ABSTRACT
Because the object of the test is to find very small polyps, which once removed will never become cancerous, it is necessary be sure the colon is free of all residue and fecal material so that there is no confusion in the results of the test. The day before your Virtual Colonoscopy you will be required to take a prep to properly cleanse your bowels. We are currently recommending that patients purchase the Fleet Prep Kit #1 and follow the instructions for the 24-hour prep. This may be purchased over the counter at your local pharmacy. Please note that some pharmacies may require a days notice to order the kit.
Prior to your scan, a small enema tip (about the size of a pen) is inserted into your rectum. The technologist will fill your colon with air which is necessary in order to visualize your bowels. The only discomfort may be a feeling of fullness due to the air. The colonoscopy itself takes only about 10-15 minutes.
The information from the CAT scanner is then shipped over a network to the 3-D image processing computer where the radiologist evaluates the images for the presence of polyps. A report and images are then sent to the referring doctor within 24 hours who can then discuss the findings with the patient.
A Virtual Colonoscopy is contraindicated in patients with rectal bleeding, history of diverticulitis, Crohn's Disease or those who have a recent colonoscopy with positive findings.
