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CT scans use ionizing radiation. It's safe to get a CT scan for a medical purpose: the marginal risks of the scan are outweighed by the diagnostic benefits. However, repeated CT scans can potentially raise the risk of cancer. Monitoring ones progress in a fitness program can easily be done with other methods that do not cause cancer. I would consider it ...


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An xray is one image. Sometimes they might take a few more. CT and MRI scans are many more images. What's more, they aren't all taken from the same place, so you have to be moved into position a few times or the equipment needs to move around you or both. If contrast is needed, the whole thing needs to be done twice - once without and once with contrast. (Or ...


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It's indeed the same "big magnet" machine as for normal MRI, but in WB-MRI (ideally) multiple coils are placed on the patient's body, e.g.: The process does indeed last 30-60 minutes (as Carey noted) as multiple scans passes are made. (More technical details in the article linked.) There's a bit of history and/or variation in WB-MRI techniques ...


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