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Figure 1 (A) Three-dimensional echocardiography (3-DE) color Doppler volume showing the Doppler signal filling the left ventricular outflow tract (LVOT). The septum can also be seen in the image. The three-dimensional volume calculation software uses the Doppler signal in the LVOT. (B) The two perpendicular cut planes of the three-dimensional Doppler volume at the level of the LVOT and aortic valve (AV). The color Doppler signal fills the LVOT. The sampling curve (the level at which the volume calculation will be performed) has been placed at the level of the AV. (C) A third plane at the level of the sampling curve (in this case the AV) as if the LVOT is being viewed from the left ventricular cavity. The color Doppler signal is seen within the outlined area of interest. (D) The flow velocity profile within the outlined area of interest over the course of the cardiac cycle and the flow rate and stroke volume calculation for that cycle in the green highlighted area.
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