boundary echo

基本解释

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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The benign and malignant breast tumors were significantly different in shape, boundary, capsules, rear echo, detection rates of minute calcification and blood flow display rates (P0.05).
良、恶性两组间在形态、边界、包膜、后方回声、微小钙化斑检出率、血流检出率比较，差异均有统计学意义（P＜0.05）。
Results Typical acoustic properties of complete PVD presented clearly the vitreous posterior boundary membrane echo, rugosity and slender wave form, which didn't connect with the eyeball wall;
结果完全性玻璃体后脱离超声表现可见玻璃体后界膜回声，呈纤细波浪状，不与眼球壁相连；