Time-signal intensity curve (TIC) of hepatic fibrosis. a. TIC analysis of S0 stage hepatic fibrosis. The red line represents the perfusion curve of the abdominal aorta; the green line represents perfusion curve of the portal vein; and the blue line represents perfusion curve of the liver parenchyma. b. TIC analysis of S4 stage hepatic fibrosis. The red line represents the perfusion curve of the abdominal aorta; the blue line represents perfusion curve of the portal vein; and the green line represents perfusion curve of the liver parenchyma.