多普勒血流信号中频谱展宽效应产生的原因及其影响因素

Causes and Influential Factors of Spectral Broadening in Doppler Flow Signal

在连续波多普勒血流测量系统中，实际接收到的频移信号是血流速度矢量的综合反映，是速度矢量在各方向上产生频移信号的叠加，并且有频谱展宽效应。表现在对应于同一个运动红细胞，探头接收到的频移信号并不是唯一的。本文建立一个模型来分析在连续波多普勒血流测量系统中频谱展宽产生的原因以及其影响因素．并且对于圆形探头给出了详细的讨论结果。

Signals received are the resultant of the blood flow phasors in CW Doppler system and there arespectral broadening phenomena in it, in other words, frequency of signals corresponding to a moving RBC is notsingle. A model is presented that enables the detailed effects of spectral broadening to be calculated for a CW Dopplersystem by using geometric boundary argument. Results are given for the circular geometry.