Positron Emission Tomography (PET) is an advanced and sophisticated imaging technique used in diagnostics that allows for the visualization and measurement of metabolic processes in the body. It uses radiotracers—a type of radioactive substance injected into the body, inhaled, or swallowed. These tracers accumulate in areas of high chemical activity, often corresponding to tissue disease sites. When these tracers decay, they emit positrons, which collide with electrons, producing gamma rays. A PET scanner detects these rays and uses them to create detailed images of the internal workings of organs and tissues. This enables physicians to observe the metabolic activity of cells, helping diagnose, stage, and monitor various diseases like cancer or neurological disorders. Positron Emission Tomography (PET) is often combined with other imaging modalities like computed tomography or magnetic resonance imaging to provide more comprehensive information about the location and nature of abnormal metabolic activity.