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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.
Advanced Search. A positron emission tomography (PET) scan is a unique type of imaging test that helps doctors see how the organs and tissues inside your body are actually functioning.The test involves injecting a very small dose of a radioactive chemical, called a radiotracer, into the vein of your arm.ne of the main differences between PET scans and other imaging tests like CT scan or magnetic resonance imaging (MRI) is that the PET scan reveals the cellular level metabolic changes occurring in an organ or tissue.