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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.
If possible, bring copies of your most recent CT, X-ray, or magnetic resonance imaging (MRI) films with you on the day of your PET/CT scan. Be prepared to stay at the imaging facility for approximately two to three hours.