In traditional pulse medical ultrasonic imaging system, the ambiguity function has periodic distance ambiguity and velocity ambiguity, this affects the image quality and resolution.

传统的脉冲式医用超声成像系统的模糊函数由于存在周期性的速度模糊和距离模糊，影响了图像的质量和分辨力。

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Methods By using the ultrasound pulse reflection law, the correlation between the process of thrombosis formation and changes in the ultrasonic velocity was studied quantitatively.

方法采用超声脉冲反射法，着重就血栓形成过程中对其声速变化的相关性进行了定量研究。

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This paper presents the development of a pulse-echo measurement method, based on the use of a phase spectrum to determine the ultrasonic wave velocity. A detailed descripsion of the theory is given.

本文报道了一种基于脉冲回波相位谱的超声波速度测量方法，并给出了它的详细理论推导过程。

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