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Pet Scans


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Just to expand a bit on Dr. Joe's answer, the PET "lights up" highly metabolically active tissues, such as inflamed joints. So if you have ordinary arthritis, for example, your joints will enhance on a PET scan. That is why they are sometimes indeterminate - anything that makes the tissue process the radioactive glucose compound quickly will cause a spot to "light up" on the PET image. (BTW, the amount of radiation is very small.)

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