To calibrate transcranial magnetic stimulation (TMS) devices before clinical trials, a 264-channel high-performance magnetic field detection system for TMS is proposed in this paper. The magnetic field detection system consists of three parts: 3D magnetic field measurement sensor (MFMS) array, 264-channel data acquisition (DAQ) card and monitor software. The 3D MFMS array is made of induction coils according to the structure of human brain. The DAQ card has 264 channels, with 4 MSps/ch maximum sampling rate and 14-bit resolution, and a good signal noise and distortion (SINAD) and crosstalk of 65.1 dB and −83.4 dB respectively. FPGA is used to control and process high-speed signals in the DAQ card. The monitor software is developed in QtCreator5.12 to process, display and backup data. The system, which is suitable for various TMS devices, can detect TMS magnetic field in real time with a relative error (RE) of 2.19%. Finally, the proposed system is used to calibrate our TMS device. The results show a good match between measurements and simulations of the TMS device with an average RE of 3.72%, which proves the system has outstanding advantages in multi-channel, synchronization, dynamic performance, data throughput, data visualization and so on.

为了在临床试验之前校准经颅磁刺激（TMS）设备，本文提出了一种用于TMS的264通道高性能磁场检测系统。磁场检测系统由三部分组成：3D磁场测量传感器（MFMS）阵列，264通道数据采集（DAQ）卡和监视软件。3D MFMS阵列由根据人脑结构的感应线圈组成。DAQ卡具有264个通道，最大采样率为4 MSps / ch，分辨率为14位，信号噪声和失真（SINAD）以及串扰分别为65.1 dB和-83.4 dB。FPGA用于控制和处理DAQ卡中的高速信号。监视软件是在QtCreator5.12中开发的，用于处理，显示和备份数据。该系统适用于各种TMS设备，可以实时检测TMS磁场，相对误差（RE）为2.19％。最后，所提出的系统用于校准我们的TMS设备。结果表明，TMS装置的测量和仿真之间的匹配良好，平均RE为3.72％，这证明该系统在多通道，同步，动态性能，数据吞吐量，数据可视化等方面具有突出的优势。