For over a quarter of a century, echocardiography has made an unparalleled contribution to clinical cardiology as a major tool for real-time imaging of cardiac dynamics. Echocardiography is widely used to assess cardiac function, and provides noninvasive information which is invaluable for the diagnosis of various disease states. In spite of its numerous advantages, in the clinical arena echocardiography has remained mostly qualitative and subjective. However, continued progress in our understanding of the interactions between ultrasound and tissue characteristics have brought about several...