Figure 3:

Comparison of four-dimensional (4D) flow magnetic resonance imaging (MRI) and transthoracic echocardiography (TTE) assessment of peak transvalvular pressure gradients. (A) Mean peak transvalvular pressure gradients ± SEM for patients pre- and post-aortic root replacement (ARR) via 4D flow MRI (dark purple) and TTE (light purple). Pre-ARR (P = 0.62). Post-ARR (P = 0.24). (B) Bland–Altman plot comparing difference between TTE and 4D flow MRI measurements and means for patients pre-ARR (dark purple) and post-ARR (light purple).