Objective: To evaluate the feasibility of identifying viable myocardium by applying low dose dobutamine echocardiography (LDDSE) combined with Doppler tissue imaging (DTI).

Objective To clarify feasibility for diagnosing coronary artery disease by quantitative tissue velocity imaging (QTVI) technique during low-dose dobutamine stress echocardiography (LDDSE).

Objective To assess myocardial viability in patients with myocardial infarction by quantitative tissue velocity imaging (QTVI) during low-dose dobutamine stress echocardiography (LDDSE).