Abstract
An ultrasonic Doppler method, by which blood flow velocities can be detected, is noninvasive and effective means for diagnosis of cardiovascular disease. In this paper, a Doppler signal processor for estimating the blood flow velocity and a color Doppler system for imaging the velocity profile are described. The processor using a programable DSP chip is developed to process the sensed Doppler signal by both instantaneous frequency method and FFT power spectrum method. In preliminary clinical trials, a new visualizing method of a cardiac structure is proposed and a clear imaging result is obtained.
