What exactly does a PET scan measure?

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What exactly does a PET scan measure?



Metabolic activity (FDG)

Detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide (tracer) which is introduced into the body on a biologically active molecule [fludeoxyglucose (FDG)]
The concentrations of tracer imaged will indicate tissue metabolic activity by virtue of the regional glucose uptake.

Can be positive in

1. Cancer
2. Inflammation
3. Mosquito bite

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