随着超声波束与血流角度的减小，检测到速度增加。

The estimated velocity increased with the decrease of Angle between the ultrasonic beam and blood flow.

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外监护。通过集中超声波束于胎儿心脏来描记胎心率，胎儿监护翻译多普勒信号。

B. External fetal monitoring. The FHR is measured by focusing an ultrasound beam on the fetal heart. The fetal monitor interprets Doppler signals.

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配置在超声波束通路中的随机相位屏的主要技术作用中断通过该屏的声波的干涉。

The major technical effect of the presence of the random phase screen in the ultrasonic beam path is the disturbing of the coherence of the wave traversing the screen.

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