The Medical Letter on Drugs and Therapeutics
CT Colonography (Virtual Colonoscopy) Revisited
The full article is available to subscribers Subscriber Login   
12/10/08: Correction: CT Colonography: In table 1 on page 94, "Invasive" has been changed to "less" and "more" rather than "no" and "yes" for CT colonography and colonoscopy, respectively. In the conclusion, "noninvasive" should be "less invasive."

Options in screening for colon cancer include fecal occult blood tests, flexible sigmoidoscopy, colonoscopy, computed tomography (CT) colonography and fecal DNA tests.1 Since the last Medical Letter article on this subject,2 more data have become available on colonography.

TECHNIQUE — Rapid helical CT scanners are used to generate both traditional axial (2-D) images and volumetric (3-D) images that create a luminal view of the colon. “Fly-through” software allows the examiner to move through the colonic lumen in a manner similar to colonoscopy, allowing polyps and mass lesions to be identified, measured, and localized. To prepare for CT colonography, patients must complete a standard bowel cleansing (clear liquid diet and cathartic) the day prior to the procedure. In some centers, patients are also asked to ingest barium and/or gastrograffin to tag fecal matter and ... more      

The Medical Letter is a subscriber-funded nonprofit organization that publishes critical appraisals of new prescription drugs and comparative reviews of drugs for common diseases.

Would you like to read the rest of this article?  Gain access below.

Subscriptions to The Medical Letter on Drugs and Therapeutics include:
  • Print version published and mailed biweekly (26 issues/year)
  • Immediate Online access to current issue and archives from 1988 to the present
  • Mobile access to our mobile site and free apps for iOS, Android and Kindle
  • FREE online per issue CME/CE
Free trial offer
3 Free Issues of The Medical Letter on Drugs and Therapeutics mailed to your home or office PLUS online access.
Try a Free Trial Subscription
Purchase this article:
Title: CT Colonography (Virtual Colonoscopy) Revisited
Article code: 1300b
 Electronic, downloadable article - $25