A PET scan, or Positron Emission Tomography scan, is a medical imaging technique that helps doctors observe metabolic processes in the body. It uses a small amount of radioactive material, which is injected into the bloodstream. This material emits positrons, allowing the scanner to create detailed images of organs and tissues, helping to identify conditions like cancer, heart disease, and brain disorders. During a PET scan, patients lie on a table that moves through a large, doughnut-shaped machine. The procedure is painless and typically takes about 30 to 60 minutes. After the scan, doctors analyze the images to assess how well organs are functioning and to detect any abnormalities.