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Alzheimer's disease, coloured SPECT scan. This is a side view of the head, with the front at right. 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 to green (least active). The most affected area is the yellow break in the red region at the front of the brain.
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