CT Virtual Colonography

CT virtual colonography is an examination of the large bowel. It involves the introduction of carbon dioxide gas into the colon via a small flexible tube inserted into the rectum. The gas distends the colon and scans are taken using the CT scanner with the patient lying on their back and on their stomach. This allows for a detailed investigation of all areas of the colon.

Before the scan is taken a small injection of Buscopan may be given to relax the bowel wall muscles. After the scans are taken, the tube will be removed from the rectum and normal activities can be resumed. Carbon dioxide is more comfortable for the patient than air, so any discomfort will pass quickly.

Preparation

A good bowel preparation is essential for this examination. A 2 day diet and laxative preparation is undertaken. Details will be provided upon booking.

Results

CT virtual colonography does require detailed processing of the data acquired from the scans. This may take some hours, but results are usually available on the afternoon of the examination. The examination usually takes place in the morning.