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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.
About 1 hour after the injection, the PET scan is done. 1  The PET scanner looks like a large, doughnut-shaped scanner, similar to a CT scanner.  The person sits or lies down on the exam table and is asked to stay very still.