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A tracer is a radioactive substance used in medical imaging to visualize internal organs and tissues. When introduced into the body, it emits radiation that can be detected by imaging technologies such as PET or SPECT scans. This allows healthcare professionals to observe metabolic activity and blood flow, helping to identify abnormalities such as tumors, infections, or organ dysfunction. By analyzing the tracer's distribution, doctors can diagnose various medical conditions more accurately.

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