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As I understand it, I think a lot depends on what they're looking for. They're all sensitive tests with different technologies, but none of them perfect. I've heard MRI is best for checking brain, CT for tissue, organs, PET shows any possible cancer activity for both organ & bone. I'm not sure, but don't hear of PET being used for tracking brain mets. Probably others know much more than me, but hope this helps.
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