Positron emission tomography (PET) is a nuclear medicine test that combines metabolic and anatomical imaging in a single scan. At the Hospital Angeles PET service, Hospital Angeles standardized protocols and advanced technology to locate lesions, measure their biological activity, and correlate it with bodily structures. This technique is essential in oncology, as it allows us to assess disease spread, evaluate response to treatment, and plan therapies with greater precision—always with safety and specialized care.