A Study on a Multichannel(128) Ultrasound Pulsed Doppler System with Serial Data Processing for Sensing the Blood Flow

혈류 진단을 위하여 직렬데이터 처리를 하는 다중(128) 채널 초음파 펄스 도플러 시스템에 관한 연구

A pulsed ultrasonic doppler flowmeter for mesurements of velocity profils in man is described. The device projects a beam of ultrasound in burst of 570 ns duration at 3.5 MHz. The back-scattered signals are processed to produce a signal oxrresponding to the mean velocity over a small region of the flowing stream. The observation range of 112mm is divided into 128 depth channels. The size of this sample volume determines the flowmeter sensitivity and accuracy. The device uses a quadrature detector to detect the direction of the moving target(hemoglobin). The main feature of the novel instrumnet is its simple hardware structure due to sequential signal processing.