Computed Tomography (CT) Imaging Study
Definition
CT colonography is a radiology test that looks at the colon (large intestine). It is one of many options for
colon cancer
screening.
Possible Complications
CT colonography is safe. It can be used if you are too sick to have other forms of colon cancer screening.
In some cases, a contrast material is used. One complication may be an allergic reaction to the contrast.
Reasons for Test
This test is used to look for
polyps
or cancers of the colon.
What to Expect
Prior to Test
- Do not eat for 8-12 hours prior to the test.
- A bowel cleansing will be done with a laxative. The goal of the cleansing is to rid your colon of all stool. The laxative will cause you to have many bowel movements over several hours.
- If you have
diabetes, talk to your doctor about adjusting your medications.
Description of the Test
You will be positioned on your back on a movable x-ray table. Just before the test, a small tube will be inserted into your rectum. Air will be gently pumped through this tube. The table will move slowly though the donut-shaped CT scanner. While this is happening, you will need to lie very still. You will be asked to hold your breath during the scan. The scanning test will then be repeated with you lying on your stomach.
After Test
You will be able to leave after the test is done. You can resume your normal diet and activities.
How Long Will It Take?
30-40 minutes
Will It Hurt?
You may feel cramping and bloating. You may feel the urge to have a bowel movement.
Results
An specialist will review the images. If something abnormal is seen, your doctor may suggest a
colonoscopy
.
Call Your Doctor
It is important to monitor your recovery. Alert your doctor to any problems. If any of the following occur, call your doctor:
- Nausea
- Itching
- Difficulty breathing
If you think you have an emergency, call for emergency medical services right away.
Definition
CT colonography is a radiology test that looks at the colon (large intestine). It is one of many options for
colon cancer
screening.
Possible Complications
CT colonography is safe. It can be used if you are too sick to have other forms of colon cancer screening.
In some cases, a contrast material is used. One complication may be an allergic reaction to the contrast.
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
Edits to original content made by Denver Health.
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All rights reserved.
a
(Computed Tomography Colonography; Virtual Colonoscopy)
References
CT colonography. Radiology Info—American College of Radiology website. Available at: https://www.radiologyinfo.org/en/info.cfm?pg=ct%5Fcolo. Updated March 17, 2016. Accessed October 3, 2017.
Fletcher RH. Colorectal cancer screening on stronger footing.
NEJM.
2008;359(12):1285-1287.
Johnson CD, Chen MH, Toledano AY, et al. Accuracy of CT colonography for detection of large adenomas and cancers.
NEJM. 2008;359(12): 1207-1217.
Mulhall P, Veerappan GR, Jackson JL. Meta-analysis: computed tomographic colonography.
Ann Intern Med. 2005;142(8):635-650.
Yee J. Screening CT colonography.
Radiol Clin North Am. 2004;42(4):757-766.
