4-D Intracardiac Ultrasound Vector Flow Imaging-Feasibility and Comparison to Phase-Contrast MRI. - Morten Smedsrud Wigen; Solveig Fadnes; Alfonso Rodriguez-Molares; Tore Bjastad; Marius Eriksen; Knut Haakon Stensath; Asbjorn Stoylen; Lasse Løvstakken (IEEE Trans. Medical Imaging, 2018)