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(a) and (b) Bar graph (upper) for the peak pressure gradient during systole in each volunteer, calculated from PC-MR and CFD. Differences in pressure gradients are relatively small except in volunteer 2. Scatter plot (lower) shows the roughly linear correlation of pressure gradient measurements with CFD and PC-MR in participants. The coefficient of determination is 0.9 and the goodness of fit is 0.7. PC: phase-contrast; MR: magnetic resonance; CFD: computational fluid dynamics.
