A 3-D differential coil design for localized magnetic stimulation
A 3-D differential coil design for localized magnetic stimulation
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DOI：
10.1109/10.951519
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发表时间：
2001-10-01
影响因子：
4.6
通讯作者：
Durand, DM
中科院分区：
文献类型：
--
作者：
Hsu, KH;Durand, DM
为了提高磁刺激的定位能力，设计了一种新颖的三维差动线圈。这种新的线圈设计由一个蝴蝶线圈和两个额外的机翼单元和一个额外的底部单元组成，两者都垂直于蝴蝶线圈的平面。机翼单元产生相反的场，限制了感应场的扩散，而底部单元则增强了激发部位的感应场。由这种新设计产生的峰值感应场位于线圈的中心，提供了一个容易识别的激励位置。新线圈的磁场定位可与小得多的线圈相媲美，但具有与当前磁刺激器兼容的电感。基于电磁感应原理，利用人体神经模型进行了数值计算，分析了新型线圈的感应场和刺激阈值。在半功率区（HPR）内，归一化感应场的大小大于1 / root2。与标准蝶形线圈相比，3d差动线圈的HPR提高（降低）了三倍。对该线圈产生的感应磁场进行了实测，结果与理论计算结果吻合。
A novel three-dimensional (3-D) differential coil has been designed for improving the localization of magnetic stimulation. This new coil design consists of a butterfly coil with two additional wing units and an extra bottom unit, both perpendicular to the plane of the butterfly coil. The wing units produce opposite fields to restrict the spread of induced fields while the bottom unit enhances the induced fields at the excitation site. The peak induced field generated by this new design is located at the center of the coil, providing an easy identification of the excitation site. The field localization of the new coil is comparable With that of much smaller coils but with an inductance compatible to current magnetic stimulators. Numerical computations based on the principles of electromagnetic induction and using a human nerve model were performed to analyze the induced fields and the stimulation thresholds of new coil designs. The localization of the coil design was assessed by a half power region (HPR), within which the magnitude of the normalized induced field is greater than 1 / root2. The HPR for a 3-D differential coil built is improved (decreased) by a factor of three compared with a standard butterfly coil. Induced fields by this new coil were measured and in agreement with theoretical calculations.