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Calculation of Induced Electric and Magnetic Field in a Spherical Brain during Magnetic Stimulation Using FDTD Method

Author: WangPin
Tutor: ZhengXiaoLin
School: Chongqing University
Course: Biomedical Engineering
Keywords: Stimulus coil Induced electric field Transcranial magnetic stimulation FDTD method
CLC: R312
Type: Master's thesis
Year: 2003
Downloads: 115
Quote: 2
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Abstract


Transcranial magnetic stimulation technology is the development of the mid-1980s up to the central nervous system conduction function and conduction disturbances detected new method, compared to traditional electrical stimulation, security, effective, painless, no damage, easy to repeat and operation and simple, making the magnetic stimulation technique widely used in all aspects of the study of brain function, brain stimulation. Induction electric field is how they are distributed in the brain is an important part of the study of magnetic stimulation of the head. At present, the induced electric field distribution in the brain there are two aspects of the problem: a brain model for isotropic, homogeneous medium, the real difference between the larger, so its results are only of theoretical significance; 2. Traditional The induced electric field calculation method is only suitable for calculating the distribution of the electric field of a certain moment, the results do not reflect the changes of magnetic field is induced in the stimulation process with time. In order to solve these two problems, we establish a hierarchical model of cerebral sphere, the sphere shell is a skull inside the brain tissue, while traditional induced electric field calculation method and finite-difference time-domain combined points of the calculated magnetic stimulation in the brain transient induced electric field values. According to traditional methods calculated induced electric coil in the air, in order to calculate the induced electric field of the incident field, the use of finite-difference time-domain method to calculate the instantaneous waveform of the the brain induced electric magnetic stimulation. Some progress made in the following aspects: 1. The brain sphere hierarchical model established, given the different electrical parameters of the skull and internal organization, as the magnetic stimulation induced electric field model is closer to the actual situation. Calculated using the traditional method induced electric field generated by the coil in the air as the incident field, the use of finite difference time domain method to calculate the transient waveform of the induced electric brain model, dynamic display of the various points in the process of magnetic stimulation induced electric field changes the process, and experimental verification of the correctness and have a better understanding of the process and mechanism of magnetic stimulation. FDTD method of calculation, Liao's absorbing boundary conditions, the formula is simple, low reflectivity, and easy to implement in the corner at. Established model closer to the real situation, there are certain practical significance, proposed a new way to be able to dynamically reflect the change of the induced electric stimulation process, help to further understanding of the mechanism of action of the magnetic stimulation. According to the actual needs of different sizes and shapes of the coil, using this algorithm to calculate the induction electric field corresponding to the stimulation site selected by calculating the results can be accurately and efficiently stimulate the corresponding parts and the scope to meet the requirements of the coil, in order to optimize the magnetic stimulator design purposes.

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