Figure 2:

Points of flow measurement of the data from four-dimensional (4D) flow MRI. Portal blood stream flows toward the liver in healthy participants (ie, from main portal vein [PV] proximal to the mesosplenic confluence [PV₁] toward the main PV at the liver hilum [PV₂], and from the splenic vein [SV] at the splenic hilum [SV₁] toward SV distal to the mesosplenic confluence [SV₂]). Blood flow in the collaterals normally flows into the PV toward the liver. In patients without cirrhosis, PV₂ should exceed superior mesenteric vein (SMV) + SV₂. Red lines indicate cut planes.