回声信号 meaning in English

echo signal

Variability of echoes
回声信号可变性
M - mode is a kind of dynamic display mode . it also uses the brightness to represent the strength of the ultrasonic returns , but the independent variable in the display is time . returns from different scanned depths are revealed along the time axis to show the movement of different layers of the scanned organs
M型是一种运动显示方式，它也是以亮度的强弱来表示回声信号强弱，但将声束路径上不同深度的回波图象沿时间轴慢慢展开，以表示界面的运动轨迹。