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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.
A scan of your entire skeleton takes as long as 60 minutes. Scanning a limited area of your body takes less time. In some cases, your doctor might order a three-phase bone scan, which includes a series of images taken at different times. A number of images are taken as the tracer is injected, then shortly after the injection, and again three to four hours later.