Schizophrenia, PET scans

Schizophrenia, PET scans

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Caption: Schizophrenia. Coloured positron emission tomography (PET) scans of axial sections through a healthy brain (left) and a schizophrenic brain (right). The colours show different levels of activity within the brain during an attention test. Red shows high activity, through yellow and green to black (very low activity). The schizophrenic brain shows much lower activity in the frontal lobes. Schizophrenia is a psychotic illness. Symptoms vary, but may include hallucinations, paranoia, disordered thinking and difficulty concentrating. PET scans use gamma cameras to detect radioactive tracers (in this case radioactive glucose), injected into the blood, that accumulate in areas of high metabolic activity.

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