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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.
CT and PET scans are different. F/U CT scan means a follow-up CT scan. At the beginning of my journey I got CT scans and PET scans separately, but for several years now I had combined scans all done in one machine at the same time. The CT scan shows the organs and any abnormalities. The PET scans are usually done with a radioactive injection after a protein only diet for 48 hours. When the PET portion is done, the patient is given some sugar substance and since cancer thrives on sugar the tumors will suck up the sugar/carbs and with the radioactivity it will glow when seen on the resultant PET scan.