December 22, 2009 11:38 AM

Studies indicate CT scans might cause cancer

Two studies in the United States have found that radiation from computed tomographic (CT) scanners may cause cancer long after patient exposure. Researchers from the University of California, San Francisco, found that CT scans emit higher levels of radiation than was thought at first. A separate study done by the National Cancer Institute estimated that radiation from more than 70 million CT scans performed in the United States in 2007 will ultimately cause about 29,000 cases of cancer, and a possible 15,000 deaths.

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