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18F-Tracers for PET hypoxia imaging grouped by parent radiosensitizers. 18F-EF1, monofluorinated etanidazole; 18F-EF3, trifluorinated etanidazole; 18F-EF5, pentafluorinated etanidazole; 18F-FAZA, 18F-fluoroazomycinarabinofuranoside; 18F-FENI, 1-(2-[18F]fluoro-1-[hydroxymethyl]ethoxy)methyl-2-nitroimidazole; 18F-FETA; 18F-fluoroetanidazole; 18F-FETNIM, 18F-fluoroerythronidazole; 18F-HX4, 18F-flortanidazole.
