“CT scans alone, which deliver 100 to 500 times the radiation associated with an ordinary X-ray and now provide three-fourths of Americans’ radiation exposure, are believed to account for 1.5 percent of all cancers that occur in the United States.  Patients may be surprised to learn that some of the newest uses of radiological imaging, including CT scans of coronary arteries to look for calcium buildup, have not yet been tested in scientifically designed clinical trials, and thus their true benefits are at best a guess.”

http://well.blogs.nytimes.com/2012/08/20/medical-radiation-soars-with-risks-often-overlooked/?src=recg

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