First Time User? Sign Up Now
First Time User? Enroll now.
Home > Health Library > Computed Tomographic Colonography
Computed tomographic colonography (CTC) is a screening test that looks for signs of colorectal cancer. This test is also called a virtual colonoscopy.
A CT scanner takes X-ray pictures of your colon and rectum from outside your body. A computer arranges the pictures into a detailed image that can show polyps or other problems. Before the scan is done, the doctor inserts a thin tube into your rectum to fill your colon with air. Air in the colon makes polyps easier to see.
Sedation isn't required, and the test itself doesn't take much time. But a CTC requires the same bowel preparation as a colonoscopy.
If the doctor sees a problem during the test, such as a polyp or abnormal tissue, you will need to have a colonoscopy so a biopsy of the polyp or tissue can be done.
Current as of:
March 27, 2018
Medical Review:Martin J. Gabica, MD - Family Medicine & Adam Husney, MD - Family Medicine & Kathleen Romito, MD - Family Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2018 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
UNC Medical Center
101 Manning Drive
Chapel Hill, NC 27514
UNC Health Care Citrix
UNC Medical Center Intranet
Copyright 2019 UNC Health Care. All rights reserved.