Alzheimer's disease, PET scan

Alzheimer's disease, PET scan

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Caption: Alzheimer's disease. Coloured axial positron emission tomography (PET) scan of the brain of a 74-year-old man with Alzheimer's disease. 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. A normal scan would reveal a more symmetrical pattern of high activity across the cerebral hemispheres (the outer left and right areas of the image). This image shows diffuse hypometabolism in the right temporal cortex. Alzheimer's is the most common form of dementia.

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