Abstract
A newly developed two-dimensional blood flow imaging system that uses the ultrasound Doppler effect is presented, in which blood flow behavior in a given cross section of a living organ is displayed in real time. To perform this, an autocorrelation technique is employed. In the technique, ultrasonic pulses are transmitted several times in the same direction and the phase shifts of the returning echoes from moving blood cells are extracted. The blood flow data obtained are displayed in color on a TV screen superimposed on tissue images that are displayed in black/white. The flow direction, speed, and variance are expressed by differences in color and brightness. Experiments were conducted with a mechanical and an electrical scanner, and good agreement with the theory was obtained. Studies on clinical significance have also been carried out at hospitals, and the usefulness of the system has been demonstrated. The system is now becoming an indispensable tool in diagnosing circulatory diseases such as heart diseases and vessel diseases.
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