经颅磁刺激圆形线圈变形对空间磁场分布的影响

The Effect on the Space Magnetic Field Distribution for the Deformation in Shape of the Round Coil in the Transcranial Magnetic Stimulation

为了降低在经颅磁刺激中对非靶点位置的刺激，使其具有更好的磁聚焦性，设计了一种变形折叠圆线圈。计算了其空间磁场分布，并与传统圆形线圈进行比较。结果表明，变形圆形线圈能有效降低传统圆形线圈一侧的磁场峰值，同时另一侧磁场峰值基本保持不变，在最佳折叠角60°～75°范围内变形圆线圈具有较好的磁聚焦性。

In order to decrease the stimulation of non target position in TMS （transcranial magnetic stimula- tion）, and have better magnetic focusing, a deformed round coil is designed. The space magnetic fields distribution are calculated. The simulated results are compared with the traditional round coil. The results show that the de- formed round coil can greatly decrease the magnetic fields on the bending side, in the meantime, the fields on the other side remain almost unchanged. The best bending angle is between 60~ and 75~ in which the deformed round coil has shown good focality of magnetic fields.