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Figure 5 Volumetric analysis of regional left ventricular (LV) function. Example of LV endocardial surface detected from a 3-dimensional (3D) data set at 3 different phases of the cardiac cycle, superimposed on a cross-sectional long-axis plane (top left). Schematic representation of the 3D segmentation model: A2C, A3C, and A4C = apical 2-, 3-, and 4-chamber planes, respectively; Ao = central point of the aortic annulus; MV = central point of the mitral valve (top right). Shaded area is an example of an LV endocardial surface segment representing the midseptal (m-sp) wall. Below are examples of regional volume and wall motion time curves and regional shortening fraction (RSF) in 6 apical segments, obtained in a normal subject (left) and a patient with coronary artery disease (CAD) (right) and hypokinesis in the lateral wall (arrow). Ant = anterior; asp = anteroseptal; inf = inferior; lat = lateral; %RR = percent of electrocardiogram RR-interval; pst = posterior; sp = septal.