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A Study on the Multi-Channel TMS Device

机译：多通道TMS设备的研究

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摘要

Transcranial magnetic stimulation (TMS) is a painless, non-invasive brain nerve stimulation technique, which has been a common diagnosis and treatment method for psychiatry and neurology in recent years. Compared with traditional single-channel magnetic stimulation coil, multi-channel coil array can achieve multi-point synchronous stimulation, scanning stimulation, and flexible switching of various stimulation patterns. Therefore, it has a great development prospect. However, the multi-channel TMS device is still in experimental stage due to the complexity of the drive circuit and the electromagnetic coupling between the coils. Aiming at these two difficulties, this paper developed a novel multi-channel TMS device. By using two closely linked coils with opposite rounded direction to replace one coil, the complexity of the drive circuit can be greatly reduced. Then, the experiment was taken to study the effect of electromagnetic coupling on pulse current in different stimulation patterns. The results show that the coupling coefficient between the adjacent coils limits the minimum amplitude ratio of the auxiliary current to main current. Therefore, the measure of reducing the coupling coefficient was studied in detail. Adding a 6.5 cm-high and 1 mm-thick copper plate in the middle of the adjacent coils was proven to be effective by simulation and experiment.
机译：经颅磁刺激（TMS）是一种无痛，无创的脑神经刺激技术，近年来已成为精神病学和神经病学的常见诊断和治疗方法。与传统的单通道磁刺激线圈相比，多通道线圈阵列可以实现多点同步刺激，扫描刺激以及各种刺激模式的灵活切换。因此，它具有广阔的发展前景。然而，由于驱动电路的复杂性和线圈之间的电磁耦合，多通道TMS设备仍处于实验阶段。针对这两个困难，本文开发了一种新颖的多通道TMS设备。通过使用两个倒圆方向的紧密连接的线圈替换一个线圈，可以大大降低驱动电路的复杂性。然后，通过实验研究了电磁耦合对不同刺激模式下脉冲电流的影响。结果表明，相邻线圈之间的耦合系数限制了辅助电流与主电流的最小幅度比。因此，详细研究了减小耦合系数的措施。通过仿真和实验证明，在相邻线圈的中间添加一块6.5厘米高和1毫米厚的铜板是有效的。

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