If you've ever had a colonoscopy--that much dreaded procedure in which a physician inserts a lighted tube into your rectum and snakes it up your large intestine, looking for abnormal growths that could lead to colon cancer--it's easy to see the appeal of the so-called virtual colonoscopy. The procedure is far less invasive: a small device blows air into the rectum to inflate the bowel while a C.T. scanner takes X rays. Unfortunately, the results from early virtual colonoscopies did not measure up. In some studies, they missed half the polyps that needed to be caught.
So there was a great...
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