X-rays and CT scans use radiation to make their pretty pictures. We put up with the small risk of radiation because there's a pretty big benefit to letting your doctor see inside you. Some scans, however, are unnecessary, and some give bigger radiation doses than you might realize. Here's how to know when to say yes to the scan, and when to ask for a second opinion.
from Lifehacker http://ift.tt/1D6MgaQ
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