A CT-scan-based, laxative-free "virtual colonoscopy" may be as effective as standard colonoscopy in finding potentially cancerous polyps, according to Massachusetts General Hospital research.
A study of patients scheduled for screening colonoscopy between June 2005 and October 2010 found computer-assisted, laxative-free CT colonography detected more than 90% of adenomas 10mm or larger. CT colonography uses computer-aided systems to "virtually cleanse" views of the colon and analyze images produced via CT scanning as opposed to direct visualization.
The technique doesn't require sedation and can be used in some patients for whom colonoscopy may not be appropriate. In the study, 62% of the study's participants said that laxative-free CT colonography was their preferred screening method, noting it was more comfortable and easier to prepare for in comparison to standard optical colonoscopy.
"While we know that colon screening can save lives, not enough people participate, in part because of the discomfort of the required laxative preparation," says study co-author Michael Zalis, MD, director of CT colonography at MGH Imaging. "In our study, the laxative-free form of CT colonography performed well enough that it might someday become an option for screening, which we hope would increase patient participation."
Mark McGraw
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