Alzheimer's disease, SPECT brain scan

Alzheimer's disease, SPECT brain scan

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Caption: Alzheimer's disease, coloured SPECT scan. This is a top view of the head, with the front at top. SPECT (single positron emission computed tomography) uses a radioactive isotope, in this case technetium-99m (Tc-99m) to show the activity of brain tissue, active tissue taking up more. Alzheimer's disease is a wasting disease of brain tissue, causing progressive dementia. Brain activity is colour-coded here, from red (most active) through yellow, green and blue to black (least active). The most affected area is at top, in the frontal lobes. These are responsible for personality and memory. For a similar scan of a healthy brain, see P332/430.

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