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The fluorescence of the liver and extrahepatic biliary tract (arrow) of the four groups of patients after using the NIRF imaging system during the operation. 8 h, patients in group A were injected with 10 mg ICG 8 h prior to surgery. 10 h, patients in group B were injected with 10 mg ICG 10 h prior to surgery. 12 h, patients in group C were injected with 10 mg ICG 12 h prior to surgery. 14 h, patients in group D were injected with 10 mg ICG 14 h prior to surgery
