Tissue Doppler echocardiographic image with longitudinal velocity, strain rate, and strain curves

An echocardiographic apical four chamber tissue Doppler image of a normal subject (left panel). The yellow line represents an ultrasound scan line with velocities from two points (V1 and V2) separated by length (L) used to determine strain rate. The right panels show a representative longitudinal velocity curve (top), a strain rate curve (middle), and a strain curve (bottom) from the same cardiac cycle in this individual.