FIG. 4.

a: The sagittal view of a rat: the liver, PV, and inferior vena cava (IVC) are clearly shown; the landmark was the upper part of PV (≈10 mm), where the flow satisfied the laminar, steady-state, and fully developed conditions. A single slice was chosen perpendicular to PV within the landmark. b: The reconstructed magnitude image where the vessel area was measured. c: The reconstructed phase image using the three-point phase unwrapping method where the velocity was measured. The IVC and PV were bright and the aorta was dark, which meant the flow direction was opposite to each other.