Tracers operate by attaching to specific molecules within the body. Once administered, they travel through the bloodstream and accumulate in areas with high metabolic activity, such as cancerous tissues. For instance, a commonly used radioactive tracer is [Fluorodeoxyglucose (FDG)](). This glucose analog is taken up by cells with high glucose metabolism, which is a characteristic of many cancer cells. Imaging techniques like PET (Positron Emission Tomography) then detect the radioactivity, providing detailed images of cancerous tissues.
