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The amount of radiation used in a PET scan is about the same amount as used in most CT scans. These scans use short-lived tracers, so the radiation is gone from your body in about 2 to 10 hours. Tell your doctor before having this test if you are pregnant or breastfeeding.
A computer program (reconstruction algorithm), like those used in computed tomography, produces an image of the distribution of the tracer in the plane of the detector ring. Most of the isotopes used in PET scanning have a half-life of only 2 to 10 minutes.