新的导管周围低回声信号到底代表什么?
水下目标回声信号的检测是主动声纳目标识别的重要内容。
Detection of echo signal is an important part of underwater object recognition.
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。
Because it is not easy to distinguish low signal of grey scale ultrasound by eyes, useful signal loss may happen.
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