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Rights: Public domain Published 21 July 2007 Size: 31 KB

Positron emission tomography (PET) is different to other medical imaging techniques because it 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. This means a PET image is a picture of what is happening metabolically in the body compared to other medical imaging techniques that show the structure or parts of the body.