Fig. 1From: Dynamic chaotic gravitational search algorithm-based kinetic parameter estimation of hepatocellular carcinoma on 18F-FDG PET/CTRegion of interest drawn in dynamic PET/CT. a CT image, b PET/CT fusion image. The HCC is shown in the black circle, background liver tissue is shown in the green circle, the portal vein is shown in the red circle, and the aorta is shown in the yellow circle. Blood 18F-FDG enters the aorta, portal vein, spleen and HCCBack to article page