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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。
In the continuous wave Doppler blood flow measurement system, the actual received frequency shift signal is a comprehensive reflection of the blood flow velocity vector, which is a superposition of the velocity vector in all directions and with the spectrum broadening effect. The performance of the corresponding movement of red blood cells, the probe receives the frequency shift signal is not unique. This article establishes a model to analyze the causes of spectral broadening in continuous wave Doppler flow measurement systems and their influencing factors. And for the round probe gives a detailed discussion of the results.