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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.
PET scan need more time than a CT scan. Because, there is a waiting time from the time of injection and the tissues take the glucose. Usually the time gap is nearly one hour. PET scan can be combined with CT scan or MRI scan.