Figure 1

4D flow MRI findings in a patient with obstructive HCM. A) 3D velocity profile in the LVOT at peak systole. This volume was queried throughout the cardiac cycle to capture the peak velocity that was used in the calculation of the MRI-measured outflow tract gradient. B) Streamline representation of flow derangement in the ascending aorta (*). This patient had an average helix grade of 1.5.