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An imaging technique that uses a small dose of a radioactive chemical (isotope) called a tracer that can detect sites of cancer growth, trauma, infection or degenerative disorders. The tracer, which is either injected into a vein or swallowed, travels through the bloodstream to the target organ, and emits gamma rays, which are detected by a gamma camera and analyzed by a computer to form an image of the target organ. (NCI)
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