COVID-19 Information: Keeping you safe is our top priority.Learn more about what to expect when you visit any LMH Health location.
View All Services
Find a New Primary Care Provider
Search by Specialty
View All Locations
Discover classes, events, tours, and groups that fit your interests.
Home > Be Healthy > 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: August 22, 2019
Author: Healthwise Staff
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.
© 1995-2020 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.