Figure 1

Aortic valve area measurement by trans-thoracic echocardiography (TTE) and cardiovascular magnetic resonance (CMR). Aortic valve area measured by continuity equation TTE approach: Left ventricular outflow tract (LVOT) diameter (A); transaortic peak velocity (B); aortic velocity-time integral (C). Oblique sagittal view of the aortic outflow tract, with the CMR slice position indicated by three white lines orthogonal to the stenotic jet (D). Oblique transaxial view of the aortic outflow tract, with CMR slice position indicated by three white lines (E). Cross-sectional view of a severely stenotic aortic valve; the white line denotes the aortic valve area (F).