Improved field localization in transcranial magnetic stimulation of the brain with the utilization of a conductive shield plate in the stimulator
Improved field localization in transcranial magnetic stimulation of the brain with the utilization of a conductive shield plate in the stimulator
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DOI：
10.1109/tbme.2006.870244
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发表时间：
2006-04-01
影响因子：
4.6
通讯作者：
Won, C
中科院分区：
文献类型：
--
作者：
Kim, DH;Georghiou, GE;Won, C
本文提出了一种精心设计的导电屏蔽板，有助于提高经颅磁刺激对神经元刺激引起的电场分布的定位。屏蔽板被引入一个8字线圈和头部之间。为了准确预测脑内场分布，检验屏蔽板的作用效果，利用磁共振图像数据，借助图像处理工具构建了一个真实的头部模型，并采用三维有限元方法。最后，为了说明所获得的改进，将结果与两种传统线圈设计进行了比较。研究发现，在线圈中加入屏蔽板，有效地提高了50%以上的感应场定位，并防止大脑的其他部分暴露于高脉冲磁场。
In this paper, a carefully designed conductive shield plate is presented, which helps to improve localization of the electric field distribution induced by transcranial magnetic stimulation for neuron stimulation. The shield plate is introduced between a figure-of-eight coil and the head. In order to accurately predict the field distribution inside the brain and to examine the effects of the shield plate, a realistic head model is constructed from magnetic resonance image data with the help of image processing tools and the finite-element method in three dimensions is employed. Finally, to show the improvements obtained, the results-are compared with two conventional coil designs. It is found that an incorporation of the shield plate into the coil, effectively improves the induced field localization by more than 50%, and prevents other parts of the brain from exposure to high pulsed magnetic fields.