In a PET scan, a small amount of radioactive glucose (FDG) is injected into the patient's bloodstream. Cancer cells, being highly metabolic, absorb more of this radioactive substance. The PET scanner detects this radiation, creating images that reflect metabolic activity. The CT scan, on the other hand, provides detailed images of the body's internal structures. When combined, these images offer a comprehensive view that helps in identifying tumors and determining their exact location.
