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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.
Patients also spend just 20 minutes in the scanner with PET/CT as compared to 45 minutes with conventional exams. Although NaF PET/CT scans deliver a slightly higher dose of radiation than conventional scans (5 mSv versus 7.4 mSv), the radiation exposure is still low. In fact, NaF PET/CT may prove accurate enough to reduce the need for additional imaging tests, leading to lower overall radiation exposure for patients.