Alzheimer's disease, PET scans

Alzheimer's disease, PET scans

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Credit: Centre Jean PERRIN, ISM/SCIENCE PHOTO LIBRARY

Caption: Alzheimer's disease. Series of coloured positron emission tomography (PET) scans of the brain of a 74-year-old man with Alzheimer's disease. There are 14 sets of axial (top), sagittal (middle) and coronal (bottom) scans. These images show a diffuse hypometabolism of the cerebral cortex mainly affecting the associative areas of the temporal cortex and temporo-parieto-occipital junctions. The colour-coded scans 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. Alzheimer's is the most common form of dementia.

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