With the method of dynamic focus, the focus point can be located in the coherence gate during the whole depth scanning. So, the lateral resolution keeps constant.
采用了动态聚焦的方法，能使整个扫描过程中，焦点一直落在相干门内，保证横向分辨率是不变的。
Real time graphic display of probe position, beam surface position, gate delay and gate width during scanning.
实时显示探针位置所对应的图形，播送表面位置，门控和门控宽度。
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