Fludeoxyglucose (18F) (INN) or fluorodeoxyglucose (18F), commonly abbreviated 18F-FDG, is a radiopharmaceutical used in the medical imaging modality positron emission tomography (PET). Chemically, it is fludeoxyglucose (FDG), a glucose analog, with the positron-emitting radioactive isotope fluorine-18. After 18F-FDG is injected into a patient, a PET scanner can form images of the distribution of FDG around the body. The images can be assessed by a nuclear medicine physician or radiologist to provide diagnoses of various medical conditions.