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My grandfather's pet scan was only scheduled to take 1 hour, but instead it took 4 hours. Dr. Joseph Accurso Dr. Accurso. Not a bad sign: Generally, if a pet/ct scan takes longer than 1 hour, it is for technical or patient motion reasons. The camera might have had a problem, or the patient may have moved and part of the scan repeated, or more of the body (legs) imaged.
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.