PROF. MICHEL ZANCA / ISM / SCIENCE PHOTO LIBRARY PROF. MICHEL ZANCA / ISM / SCIENCE PHOTO LIBRARY
Alzheimer's brain activity. Single-photon emission computed tomography (SPECT) scans comparing the blood flow, and therefore metabolic activity, in the brain of a healthy patient (top eight scans) with that of a patient with moderately advanced Alzheimer's disease (bottom four scans). Intravenous injection of Tc-99m-ECD.
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