Simulation study of electromagnetic field distribution when combining TMS with EEG(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2023年第3期
- Page:
- 369-377
- Research Field:
- 医学生物物理
- Publishing date:
Info
- Title:
- Simulation study of electromagnetic field distribution when combining TMS with EEG
- Author(s):
- WANG Yao1; LU Mai2
- 1. School of Automation and Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2. Key Lab of Opt-Electronic Technology and Intelligent Control of Ministry of Education, Lanzhou Jiaotong University, Lanzhou 730070, China
- Keywords:
- Keywords: transcranial magnetic stimulation electroencephalogram human head model electromagnetic field
- PACS:
- R312；TM153
- DOI:
- DOI:10.3969/j.issn.1005-202X.2023.03.017
- Abstract:
- Abstract: Objective To analyze the distributions of magnetic induction intensity and induced electric field intensity in the combined action of transcranial magnetic stimulation (TMS) and electroencephalogram (EEG). Methods The finite element multi-physics field simulation software COMSOL was used to model the 3-layer concentric spherical human head, TMS coil and EEG electrodes. The differences in magnetic induction intensity and induced electric field intensity of the human head model with and without brain electrodes are compared and analyzed in the presence of TMS coil. Results The magnetic induction intensity and the induced electric field intensity were changed at several specific points in the head after the placement of brain electrodes. The magnetic induction intensity had a maximum change up to 19.19%, and the maximum change in induced electric field intensity was 75.33%. After the placement of brain electrodes, the maximum magnetic induction intensity of YZ longitudinal section of human head was decreased by 7 mT, and the maximum induced electric field intensity was decreased by 0.6 V/m. Both the three-dimensional magnetic induction intensity and the induced electric field intensity at the brain were decreased gradually with the increase of depth. After the placement of brain electrodes, the maximum magnetic induction intensity and the maximum induced electric field intensity in the brain tissue were decreased by 1.4 mT and 0.13 V/m, respectively. Conclusion When TMS and EEG are combined, the placement of brain electrodes at the human scalp will change the electromagnetic field distribution, indirectly affecting the therapeutic effect of TMS.
Last Update: 2023-03-29