Fig. 2

4D Flow CMR assessment of mitral regurgitation. a Shows four-dimensional mitral regurgitation flow streamline. b Demonstrates mitral forward flow visualised by 4D Flow CMR and c quantification of mitral forward flow by phase-contrast image obtained from 4D Flow CMR. d Shows aortic forward flow and e quantification of aortic forward flow by phase-contrast image obtained by 4D Flow CMR