Two dimensional image was obtained by transesophageal echocardiography. The thickness, wave time and velocity were showed during atrial septal motion by omni directional M mode echocardiography (OME).
应用经食管超声心动图获得二维图像，全方向M型超声显示并测量房间隔运动时的厚度、波幅时间及速度。
The group velocity(U) corresponds to the net result from the addition of all elements with different periods and different velocities within the wave motion.
而群速度（U）符合于波动的不同周期，不同速度的各种因素叠加的净结果。
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