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Positron Emission Tomography (PET) is a medical imaging technique that helps visualize and measure metabolic processes in the body. It is often used in clinical and research settings to assess conditions such as cancer, neurological disorders, and cardiovascular diseases. Here's how PET works: 1. **Radiotracer Injection**: A small amount of a radioactive substance, called a radiotracer, is introduced into the body, usually via injection.