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Example of delineation of gross tumor volume (GTV) and corresponding hypoxic GTV (GTVh) by fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) and fluorine-18–labeled fluoromisonidazole (18F-FMISO) PET/CT image fusion. (a) CT axial slice, (b) FDG-PET axial scan, and (c)18F-FMISO PET axial slice.
