Fig. 5

Correlation of 4D flow CMR-derived flow rates and preset flow rates. Preset TIPS flow rates were increased from 0.8 to 2.8 l/min and flow measurements were performed using velocity encoding both at 1 m/s (black crosses) and at 2 m/s (red dots). Flow measurements were performed at indicated levels. 4D flow CMR-derived flow rates were significantly correlated with the preset flow rates at all vascular levels and within the stent graft (all r ≥ 0.985 and all p ≤ 0.049). At velocity encoding of 1 m/s, flow measurements were excluded if velocities exceeded velocity encoding and caused aliasing artifacts. At velocity encoding of 2 m/s, aliasing did not occur. SMV  superior mesenteric vein, SV  splenic vein, PV  portal vein, TIPSb  bare part of the stent, TIPSp  portal sided third of the stent, TIPSm  middle third of the stent, TIPSv  venous sided third of the stent