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Method for determining the velocity-time spectrum of blood flow
Method for determining the velocity-time spectrum of blood flow
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机译：确定血流速度-时间谱的方法
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摘要
Method for determining the velocity-time spectrum of blood flow in a living body by means of an ultrasonic pulsed wave Doppler system, comprising:PPsequential transmission of pulsed ultrasonic waves and receiving a corresponding sequence of echo signals, P Psampling the received echo signals at one or more predetermined time delays after transmitted ultrasonic pulses, and PP processing said sequence of echo signal samples by frequency spectrum analysis to obtain a blood velocity spectrum comprising a number of velocity components within a range of expected blood velocity values, andPPrepeating said processing a plurality of times to obtain a velocity-time spectrum for substantially real-time display. PPFor each velocity component in said blood velocity spectrum the received echo signals are sampled with subsequent increase or decrease in said predetermined delay after pulse transmission according to the change in round-trip time of the ultrasonic pulses reflected from blood moving with a velocity corresponding to each said velocity component. The resulting sequence of signal samples is processed to obtain said velocity component.
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