CT is a sensitive diagnostic tool that uses X-rays to take a series of two dimensional cross-sectional images ('slices') around an axis. It is used to image many diseases and injuries and has been in widespread use since the early 1970's.
Using X-rays does carry a small risk. To put this into context, a CT scan will deliver approximately the same amount of radiation you would absorb from your normal surroundings in about three years. Another way of looking at this is to say that the benefits of having a scan outweigh the risks associated with it.
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