ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY
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A positron emission tomography (PET) scan showing a transverse section of a healthy brain. PET scans are made possible by radioactive materials (radiotracers) that are injected into the patient's veins. The radiotracers allow physicians to see the patient's tissue activity at a cellular level.
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