ABSTRACT
The edge between the left ventricular (LV) cavity and the myocardium is represented by the endocardial border that reflects echoes with a certain thickness. The leading edge of a structure is defined as the portion of the border closest to the transducer, while the trailing edge is the portion furthest from the transducer. In two-dimensional (2D) echocardiography, the inner edge is defined as the portion of the border closest to the center of the structure while the outer edge is the furthest from it (Fig. 5.1). Several conventions have been proposed to measure the size of cardiac structures, which differ on the basis of imaging mode, and whether to include the thickness of edge echoes in the measurements.
