Fig. 6From: Validation of 4D flow cardiovascular magnetic resonanceĀ in TIPS stent grafts using a 3D-printed flow phantomCorrelation of 4D flow CMR- and 2D PC CMR-derived flow velocities. Preset flow rates were increased from 0.8 to 2.8Ā l/min and velocity measurements were performed using velocity encoding both at 1Ā m/s (black crosses) and at 2Ā m/s (red squares). Flow measurements were performed at indicated levels. 4D flow CMR-derived velocities were significantly correlated with 2D PC CMR-derived flow velocities at all vascular levels and within the stent graft (all rāā„ā0.958 and all pāā¤ā0.024). At velocity encoding of 1Ā m/s, velocity measurements were excluded if velocities exceeded velocity encoding and caused aliasing artifacts. At velocity encoding of 2Ā m/s, aliasing did not occur. SMVāāsuperior mesenteric vein, SVāāsplenic vein, PVāāportal vein, TIPSbāābare part of the stent, TIPSpāāportal sided third of the stent, TIPSmāāmiddle third of TIPS stent, TIPSvāāvenous sided third of the stentBack to article page