Pozitron Emisyon Tomografisi (PET) is a medical imaging technique that helps visualize metabolic processes in the body. It uses a small amount of radioactive material, called a radiotracer, which is injected into the patient. This radiotracer emits positrons, which collide with electrons in the body, producing gamma rays that are detected by the PET scanner. The images produced by PET can reveal information about the function of organs and tissues, making it useful for diagnosing conditions such as cancer, heart disease, and brain disorders. By highlighting areas of abnormal activity, PET aids doctors in planning effective treatment strategies.