威达低磁场磁共振表面线圈的改进

Improvement of the surface coil of WEIDA low magnetic field imaging system

用壁厚为0．7mm的Φ6mm铜管取代了绕制线圈用的3000股丝包线，将威达公司低场磁共振成像系统表面线圈的工作频宽从50kHz降至30kHz、Q值从原来的60倍提高到136倍、图像信噪比由原来的12提高到23。

By Replaceing Litg wire with cupper tube (Φ6mm,thickness 0. 7mm ),we increase the WEIDA low magnetic field imaging system surface coil's signal to noise ratio from l2 to 23,quality factor from 60 to 136,and reduce bamdwidth from 50 kHz to 30kHz.