a Bland-Altman plots of peak velocities at all cross-sectional slice from repeat PC-MRI scans and the derived ΔP of the phantom models. Mean (bias) and 95% confidence internal limits are displayed. b Pressure measurement comparison between ΔP calculated via NS-equations and ΔP measured using pressure transducer. Excellent correlation (R2 = 0.938) was observed between the two techniques. c % area stenosis versus ΔPMR measurement. An exponential increase in ΔPMR was observed as % area stenosis increases.