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Simulation Study on Distributions of Electric Field & Electric Energy Induced by TMS in Head and Optimization of the Coil

Author: ZhaoZuo
Tutor: YinTao；LiuZhiPeng
School: Beijing Union Medical College
Course: Biomedical Engineering
Keywords: Transcranial magnetic stimulation (TMS) Induced electric field Head model Energy distribution The mosquito coils type of coil Ansys Comprehensive comparison function Coil new program Stimulation threshold Eyeball model
CLC: R310
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Transcranial magnetic stimulation techniques in the treatment of diseases of the brain function more and more attention by the more and more popular because of its non-invasive painless advantages. Magnetic stimulation coil induction electric field distribution characteristics as well as the induction energy characteristics can provide important support for the development of magnetic stimulation. This paper presents the use of simulated human scalp, skull, cerebrospinal fluid, brain gray matter and white matter structures five concentric spherical model simulation study. On this basis, focusing on eight coil induced electric field intensity distribution characteristics, and the induced electric energy distribution characteristics and comparison with the simple the conductor block coil model by mosquito coils horoscopes coil, reflects the different modeling analysis the impact of the results; paper also proposed a the induced electric horoscopes coil is a way to improve the focus of the new program, analysis of the overall performance of the new program on the basis of the comprehensive two characteristics; addition, the establishment of the helmet model is closer to the real situation, and further simulation study based on horoscopes coil magnetic stimulation, taking into account the stimulation threshold parameter, to discuss practical issues related to the magnetic stimulation study; Finally, this helmet model and five-sphere model simulation results were compared, and thus explain different models of simulation results. The tools simulation used in this paper is to scale finite element analysis software ANSYS 11.0. Characteristics of the induced electric field distribution in this article this article put forward the concept of using a focused volume reflect focus; This paper evaluation coil induction electric field intensity distribution characteristics, and the establishment of a comprehensive survey of peak electric field, focusing the volume as well as the comparison function of the peak-to-peak ratio for more scientific and unified field distribution of the performance of different coil, further optimization of the coil parameters. Induced electric field energy distribution is also one of the key coil optimized, so this paper, considering the induction energy distribution rate comparison function concentrated and utilization factors comprehensive evaluation coil energy distribution characteristics; comprehensive evaluation coil performance, this paper established a comparison function that contains the field distribution and energy distribution, the comparison function is concerned about the characteristics of the five-layer sphere model of magnetic stimulation the target regional brain gray matter, and scalp some characteristics of the coil performance evaluation more practical. In this thesis, new exploration and research, simulation studies and coil optimized magnetic stimulation of the findings and follow-up work carried out will provide useful ideas.

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