The influence of tissue conductivity on the calculation of electric field in the transcranial magnetic stimulation head model.
10.7507/1001-5515.202211070
- Author:
Ruiqi NIU
1
;
Cheng ZHANG
1
;
Changzhe WU
1
;
Hua LIN
2
;
Guanghao ZHANG
1
;
Xiaolin HUO
1
Author Information
1. Beijing Key Laboratory of Bioelectromagnetism, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China.
2. Department of Neurology, Xuanwu Hospital of Capital Medical University, Beijing 100053, P. R. China.
- Publication Type:Journal Article
- Keywords:
Diffusion tensor imaging;
Induced electric field;
Tissue conductivity model;
Transcranial magnetic stimulation
- MeSH:
Transcranial Magnetic Stimulation;
Diffusion Tensor Imaging;
Electric Conductivity;
Electricity;
Scalp
- From:
Journal of Biomedical Engineering
2023;40(3):401-408
- CountryChina
- Language:Chinese
-
Abstract:
In transcranial magnetic stimulation (TMS), the conductivity of brain tissue is obtained by using diffusion tensor imaging (DTI) data processing. However, the specific impact of different processing methods on the induced electric field in the tissue has not been thoroughly studied. In this paper, we first used magnetic resonance image (MRI) data to create a three-dimensional head model, and then estimated the conductivity of gray matter (GM) and white matter (WM) using four conductivity models, namely scalar (SC), direct mapping (DM), volume normalization (VN) and average conductivity (MC), respectively. Isotropic empirical conductivity values were used for the conductivity of other tissues such as the scalp, skull, and cerebrospinal fluid (CSF), and then the TMS simulations were performed when the coil was parallel and perpendicular to the gyrus of the target. When the coil was perpendicular to the gyrus where the target was located, it was easy to get the maximum electric field in the head model. The maximum electric field in the DM model was 45.66% higher than that in the SC model. The results showed that the conductivity component along the electric field direction of which conductivity model was smaller in TMS, the induced electric field in the corresponding domain corresponding to the conductivity model was larger. This study has guiding significance for TMS precise stimulation.
