用一根顶端带有气囊的特殊的导管在房间隔(左心房和右心房之间的壁)上造一个口。
A special catheter with a balloon in the tip is used to create or enlarge an opening in the atrial septum (wall between the left and right atria).
在装置中间，其中一根光纤用于传输入射激光，周围多根光纤与中心光纤等间隔，用于接收血液中的散射光。
The central one of the fiber probe is used for transmitting laser beam, the others having same spaces to the center one are used for receiving scattered signal.
微根管观测精度主要取决于微根管安装的质量和数量、微根管取样间隔期和取样数量、微根管图像分析技术等。
The factors affecting fine root measurement and its precision mainly included the quality and quantity of tube installation, sampling interval and quantity, and analysis technique of images, etc.
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