Based on high-frame-rate digital subtraction echography (HFDSE), we de
veloped a new imaging method to visualize blood flow, i.e., two-dimens
ional moving target indication (2D-MTI). This method reveals blood flo
w on a plane by extracting a moving target in the blood flow from ultr
asonic B-mode images and tracking it on successive images. Experiments
were performed using a model flow path. The results show that particl
es were extracted from ultrasonic B-mode images, and flow was visualiz
ed.