(a) Flow waveform in a normal subject distal to the aortic valve from Spiral and Cartesian Single Venc and Spiral Dual Venc acquisitions. (b) Waveforms measured with the same sequences in a different normal subject. (c) Scatterplot of flow data for all healthy volunteers (n = 6, Pearson correlation coefficient of 0.970). (d) Scatterplot of flow data for all patients with severe aortic stenosis (n = 7, Pearson correlation coefficient of 0.952). For both (c,d), flow rates for a specific slice, timepoint, and volunteer are single points.