The tumor displayed the character of low echo (21/32), obscure boundary(22/32), vascular invasion (26/32), pancreatic duct and common bile duct dilation (19/36).

结果超声内镜下胰头癌主要表现为边界不清晰（22/32）的低回声（21/32），伴有胆总管和胰管的扩张（19/36）、血管的侵犯（26/32）；

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The size, echo, boundary and color flow signals of renal lesions were observed by conventional US.

常规超声检查观察肾占位大小、回声、边界、有无彩色血流信号。

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Ultrasonic encounter impurities or boundary surface will produce significant reflection form reflex into echo, encounter moving objects can produce doppler effect.

超声波碰到杂质或分界面会产生显著反射形成反射成回波，碰到活动物体能产生多普勒效应。

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