Positron emission tomography (PET) is a medical imaging technique that helps visualize metabolic processes in the body. It uses a small amount of radioactive material, called a tracer, which is injected into the bloodstream. As the tracer emits positrons, it interacts with electrons in the body, producing gamma rays that are detected by the PET scanner to create detailed images. PET scans are commonly used in oncology to detect and monitor cancer, as well as in neurology to study brain disorders. This non-invasive procedure provides valuable information about the function of organs and tissues, aiding in diagnosis and treatment planning.