CENTRE JEAN PERRIN / ISM / SCIENCE PHOTO LIBRARY CENTRE JEAN PERRIN / ISM / SCIENCE PHOTO LIBRARY
Normal brain activity. Coloured positron emission tomography (PET) scan of an axial section through the healthy brain of an 80-year-old man, showing normal activity in the cerebral cortex (1), striatum (2, putamen and caudate nucleus) and thalamus (3). The radioactive tracer used was F18-FDG.
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