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A positron emission tomography (PET) scan is an imaging test that allows your doctor to check for diseases in your body. The scan uses a special dye that has radioactive tracers. These tracers are injected into a vein in your arm. Your organs and tissues then absorb the tracer.
It can help the doctor decide on the best treatment for a patient. PET/CT also can show how the cancer is responding to treatment. This patient education page tells you how PET/CT works. It also tells what you need to do when you have a PET/CT scan procedure.