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Rights: National Aeronautics and Space Administration (NASA) Published 21 July 2007 Size: 26 KB

PET scans showing changes caused by Parkinson's Disease.

PET requires patients to be injected with a radioactive substance. The images a PET scanner produces shows where in the body the radioactive substance has been transported, in this case the brain. This means a PET image is a picture of what is happening metabolically in the body.