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X-plane from 3D TEE system demonstrating in left panel cross section of aortic valve in a short axis view at the level of the aortic annulus; right panel, long axis view of left ventricular tract and aorta. Note: Dimension of aortic annulus is different in the short axis and long axis planes. (From Siegel et al. Int J Cardiovasc Imaging 2011, in press, with permission)
