提高脑神经磁刺激感应电场聚焦性能的线圈参数优化方法的研究  

Optimization of the Coil Focalizing the Electrical Field Induced by Magnetic Stimulation in the Human Brain

作　　者：蒲莉娜[1] 殷涛[1] 安好[1] 李松[1] 刘志朋[1] 

机构地区：[1]中国医学科学院北京协和医学院生物医学工程研究所,天津300192

出　　处：《生物医学工程研究》2008年第2期74-78,共5页Journal Of Biomedical Engineering Research

基　　金：天津市重点攻关项目(06YFSZSF00700);科技部科学仪器设备升级改造专项项目(2006JG004700)

摘　　要：本研究提出一个衡量磁刺激线圈聚焦性的比较系数,比较不同形状线圈的感应电场聚焦性,研究线圈参数的优化方法。我们建立了磁刺激感应电场分布的数学模型,以Matlab作为仿真工具,以能够反映线圈刺激效果的比较系数ξ为指标,分析比较了几种不同线圈的聚焦性,以及成不同角度的线圈聚焦性。结果表明:四叶玫瑰形为刺激聚焦性最好的线圈形状,该线圈半径越小,聚焦性越好,成102°角的四叶玫瑰线形线圈具有最佳聚焦性,而且112°角四叶玫瑰形线圈与89°角线圈组合成的线圈阵列聚焦性最好。由此说明本研究中的比较系数可用于比较线圈聚焦性,对线圈参数的优化设计具有一定的指导意义。A coefficient to evaluate the focus of the electrical field intensity induced by magnetic stimulation was firstly presented in this study, which was used as an index of focus.Matlab was used as the tool to simulate the distribution of induced electrical field, mathematic model was set up to study the distribution of the electric field induced by magnetic stimulation, comparison was made to analyze the focus of coils with different shapes. Result showed that the four-leaf rose shape coil was the best one compared with other five different shapes of coil. As a result of optimizing other parameters of the coil, the smaller radius of the coil was the better choice and the angle between four-leaf rose coil of 102° was better than that of other values. Furthermore, when the four-leaf coil with angle of 112° assembled with a coil of 89°, the more focused electrical field was obtained.These results demonstrate that the coefficient proposed can be used to study the focus of electrical field induced by magnetic stimulation, it may be a guideline to the optimization of the coil＇s parameters.

关 键 词：磁刺激 线圈 聚焦性 感应电场 比较系数 四叶玫瑰线形 

分 类 号：R318[医药卫生—生物医学工程]