Assessment of superior mesenteric vascular flow quantitation in children using four-dimensional flow magnetic resonance imaging: A feasibility study

Figure 1 Flow velocity measurements of the superior mesenteric artery and superior mesenteric vein. A: Flow velocity measurements of the superior mesenteric artery. Regions of interest were placed in the perpendicular plane to the blood flow at proximal section (1), curved mid-section (2), and distal straight section before the first jejunal branching (3); B: Flow velocity measurements of the superior mesenteric vein. Regions of interest were placed in the perpendicular plane to the blood flow at the proximal section adjacent to the confluence of small venous tributaries (1), mid-section in between the proximal and distal sections (2), and distal section just below to the spleno-portal venous confluence (3); C: Tempus pixel web-based software demonstrating streamlines in the superior mesenteric artery (1) and superior mesenteric vein (2). The vectors were applied as references for the accurate perpendicular plane for flow velocity measurements. SMA: Superior mesenteric artery; SMV: Superior mesenteric vein.