Positron Emission Tomography (PET) is a medical imaging technique that helps visualize metabolic processes in the body. It works by injecting a small amount of a radioactive tracer, which emits positrons, into the patient. As the tracer accumulates in certain tissues, a special camera detects the emitted radiation, creating detailed images of the body's internal functions. PET scans are commonly used in oncology to detect cancer, assess treatment effectiveness, and monitor disease progression. They can also aid in diagnosing neurological disorders and evaluating heart conditions. This non-invasive procedure provides valuable information for doctors to make informed decisions about patient care.