角度提取法双向定量血流速度仪的研制

ANGLE EXTRACTION TECHNIQUE FOR DIRECTIONAL AND QUANTITATIVE BLOOD FLOW VELOCITY MEASUREMENT WITH DOPPLER ULTRASOUND

提出了一种实现血流速度定量、双向检测的简单而且准确的方法。采用直接分离法实现血流速度的双向输出,利用角度提取法原理实现血流速度的定量输出。当偏角在-18～20°范围内变化时,此仪器的定量输出误差小于5%,其方向分离比大于42 dB。文中还给出了正常与异常的血流速度测试结果。

A simple but accurate method is developed to realized directional and quantita-tive measurement of blood flow velocity. Sideband filters are employed to get hi-direction output of blood flow. Angle extraction technique is suggested to obtainquantitative measurement. It shows that relative error is less than 5% while theangle deviation varies from -18 to +20°and separation of forward and reversevelocity is more than 42 dB. The blood flow velocity of normal and abnormal casesare also reported.