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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.
Order a PET Scan. Positron Emission Tomography (PET Scan) cannot tell you the shape or the exact size of the spot. It is not very good at determining location. However, PET Scan can tell whether a lesion is growing. PET is a test for tissue activity. A scar is not very active and so the PET Scan does not see it.