Alzheimer's disease, PET scan

Alzheimer's disease, PET scan

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Credit: CENTRE JEAN PERRIN, ISM/SCIENCE PHOTO LIBRARY

Caption: Alzheimer's disease. Coloured axial positron emission tomography (PET) scan of the brain of a 74-year-old male patient with Alzheimer's disease (left) compared with a normal brain (right). The colour-coded scan shows metabolic activity from low (blue) to high (red, pink and white). PET scanning utilises an injected radioactive tracer to reveal variations in metabolic activity in the brain. This patient's brain shows diffuse hypometabolism in the right temporal cortex. The normal scan reveals a more symmetrical pattern of high activity across the cerebral hemispheres. Alzheimer's is the most common form of dementia.

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