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Created page with "==Introduction== Positron emission tomography (PET) is a nuclear medicine functional imaging technique that produces a three-dimensional image of functional processes in the body. The system detects pairs of gamma rays emitted indirectly by a positron-emitting radionuclide, also known as a tracer, which is introduced into the body on a biologically active molecule. PET is both a medical and research tool, and is used heavily in clinical oncology and for clinical diagnosi..."
