Radiology·Radiology
CT colonography
Informed by recognized medical guidance
Overview
CT colonography (also called virtual colonoscopy) is a special type of CT scan that takes detailed pictures of your large bowel (colon) and rectum. It uses X-rays and a computer to create 3D images, so doctors can look for polyps (small growths) or signs of cancer without needing a tube inserted into your bowel.
Key facts
- It is less invasive than traditional colonoscopy because no camera is passed into the bowel.
- You will need to follow a special diet and take laxatives to clean out your bowel before the scan.
- If the scan finds a polyp, you may need a separate colonoscopy to remove it.
CT colonography is becoming more common as a screening test for bowel cancer, especially for people who cannot have a standard colonoscopy or prefer a less invasive option.
It is mainly used for adults aged 50 and over, or younger people with a higher risk of bowel cancer (such as a family history). Your doctor will decide if it is right for you.