Because it is not easy to distinguish low signal of grey scale ultrasound by eyes, useful signal loss may happen.

灰阶超声由于低回声信号不易为人眼识别，甚至有用信息丢失。

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Individual joints were scanned for grey scale (GS) and power Doppler (PD) signal using a semi-quantitative scoring scale (0-3) for each parameter.

获取每个关节的灰阶(GS)和强力多普勒(PD)信号，采用半定量法为每个参数进行评分(0 - 3)。

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