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Figure 2 Left ventricular volume measurement by the apical six-plane method. Using as an axis of rotation the line from the apex to the center of the mitral valve annulus, the 3D Echotech system displayed the RT3DE images as six consecutive longitudinal planes rotated 30° from each adjacent plane. The LV cavity in each plane was traced manually, and the LV volume calculated by the multiplanar Simpson’s method. LV = left ventricle; RT3DE = real-time three-dimensional echocardiography.
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