Fluorine-18 labeled fluorodeoxyglucose.  18F-FDG is a radioactive material that is frequently used in PET scanning. 18F-FDG is a compound composed of a radioactive fluoride atom (18F) attached to a glucose (sugar) molecule. Once injected into the body, 18F-FDG is attracted to cells that exhibit high levels of sugar processing (such as actively grow [..]