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Normal and Alzheimer's disease brains

Normal and Alzheimer's disease brains

M108/0354

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Credit

DR ROBERT FRIEDLAND / SCIENCE PHOTO LIBRARY DR ROBERT FRIEDLAND / SCIENCE PHOTO LIBRARY

Caption

Alzheimer's disease. Coloured Positron Emission Tomography (PET) scans of the brain of a normal patient (left) versus an Alzheimer's disease patient. Horizontal brain sections are seen. Colour-coding: high brain activity (red and yellow); low activity (blue and black). The scan on the right shows reduction of both function and blood flow in both sides of the brain, a feature often seen in Alzheimer's. Alzheimer's disease is a major cause of dementia in the elderly. To obtain the PET scans a radioactive tracer is injected into the blood to reveal metabolic activity in the brain.

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