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。
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.
孔径聚焦技术是B型超声诊断仪中一种提高近场区域横向分辨力的有效手段。
The aperture focusing technology is an effective means of the improving near field lateral resolution in ultrasonic diagnostic B-sanner.
OCT的动态聚焦是一种在大成像深度范围内保证横向分辨率的有效方法。
Dynamic focusing is an effective method to keep high lateral resolution of OCT.
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