Tissue Doppler Imaging Optical Flow (TDIOF): A Combined B-Mode and Tissue Doppler Approach for Cardiac Motion Estimation in Echocardiographic Images. - Vahid Tavakoli; Nirman Bhatia; Rita A. Longaker; Marcus F. Stoddard; Amir A. Amini (IEEE Trans. Biomed. Eng., 2014)