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检索条件"机构=Key Lab. of Opt-Electronic Technology and Intelligent Control"

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Deep Transcranial Magnetic Stimulation Using the Semi-Halo Coil

Deep Transcranial Magnetic Stimulation Using the Semi-Halo C...

引用

Progress in Electromagnetic Research Symposium

作者： Mai Lu Shoogo Ueno Xu-Wei Dong Key Lab. of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Department of Applied Quantum Physics Graduate School of Engineering Kyushu University

ISBN: (纸本)9781509060948

This study presents the numerical simulation of deep transcranial magnetic stimulation dTMS by considering the semi-Halo coil working with a circular coil, i.e., semi-Halo-circular assembly coil (sHCA coil). Three-dimensional distributions of the induced magnetic field and electric field in realistic head model were obtained by impedance method, and the results were compared with the normal Halo-circular assembly coil (HCA coil). It was found the potential disadvantage of wide distribution of the electric field under the perimeter of the HCA coil can be alleviated by employing the new coil design. The sHCA coil may offer a new tool for dTMS with potential for both research and clinical applications for psychiatric and neurological disorders associated with dysfunctions of deep brain regions.

关键词： Coils Electric fields circular coil Characteristic impedance induction field Transcranial Magnetic Stimulation Neurologic Disorders perimeter Clinical applications brain region functional failure numerical simulation

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Study of Specific Absorption Rate (SAR) Induced In Human Endocrine Glands For Using Mobile Phones

Study of Specific Absorption Rate (SAR) Induced In Human End...

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Asia-Pacific Symposium on Electromagnetic Compatibility

作者： Mai Lu Xiao-Yan Wu Key Lab. of Opt-Electronic Technology and Intelligent Control (Lanzhou Jiaotong University) Ministry of Education 730070 China Department of Endocrinology The First Hospital of Lanzhou University 730000 China

ISBN: (纸本)9781467383103

With the quick development and widespread use of mobile phones has led to arising concern about the possible adverse health effects of radio frequency electromagnetic field exposure. This study aims to present the dosimetry analysis of the electromagnetic fields induced by mobile phone on human endocrine glands. A finite-difference time-domain (FDTD) method was employed to calculate the specific absorption rate (SAR) in a realistic human head-neck model from exposure to a generic handset at 1750 MHz. The results show that the locally induced SAR in thyroid gland is much larger than that in both hypophysis and hypothalamus glands. The induced SAR in thyroid for the mobile in short message service (SMS) position is much larger than that in the voice position. However, in all of the examined cases, the SAR values in endocrine glands are all below the IEEE safety standard.

关键词： Dosimetry Endocrine glands Mobile phone Specific absorption rate

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Numerical simulation of deep transcranial magnetic stimulation by multiple circular coils

Numerical simulation of deep transcranial magnetic stimulati...

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13th Mediterranean Conference on Medical and Biological Engineering and Computing 2013, MEDICON 2013

作者： Lu, M. Ueno, S. Lanzhou Jiaotong University Key Lab. of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou 730070 China Kyushu University Department of Applied Quantum Physics Graduate School of Engineering Fukuoka 812-8581 Japan

ISBN: (纸本)9783319008455

Stimulation of deeper brain structures by tran-scranial magnetic stimulation (TMS) plays a role in the study of reward and motivation mechanisms, which may be beneficial in the treatment of several neurological and psychiatric disor-ders. This paper presents a numerical simulation of deep tran-scranial magnetic stimulation (dTMS) in a realistic head model by considering large circular coil surrounding the head combi-nation of smaller coils. Three-dimensional distributions of the induced electric fields in the head were calculated by employing impedance method. Simulation results show that multiple circu-lar coils provides a potential way to produce deeply penetrating electric fields in deep brain regions with less fields in superficial cortical tissues. © Springer International Publishing Switzerland 2014.

关键词： Electric fields

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Dosimetric evaluation of specific absorption rate in realistic head models with different sizes in mobile phone usage

Dosimetric evaluation of specific absorption rate in realist...

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General Assembly and Scientific Symposium, URSI

作者： Mai Lu Shoogo Ueno Key Lab. of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Lanzhou P. R. China Department of Applied Quantum Physics Kyushu University Japan

ISBN: (纸本)9781467352246

This paper presents finite-difference-time-domain (FDTD) calculations of the specific absorption rate (SAR) in realistic head models from exposure to a generic handset working as 1750 Mhz. The head models with different sizes were obtained from the same whole-body model. The purpose of this work is to study whether there is a variation of SAR absorption in the same brain, but the sizes of head models are different. The obtained peak SARs in each of the tissues were averaged over 10 grams of tissue in the shape of cube. It was found that the SAR absorption in human brain is dependent on the size of the head model. The induced SAR in brain tissues in smaller head model is larger than that in larger head model. It suggested that the mobile phone dosimetric analysis in most of the previous literatures which only considered head model in the simulation may overestimate the brain exposure compared to the practical situation that the whole-body exposed to the fields radiated by the mobile phone.

关键词： Brain models Mobile handsets Biological system modeling Magnetic heads Solid modeling Specific absorption rate

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Toward deep transcranial magnetic stimulation

Toward deep transcranial magnetic stimulation

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General Assembly and Scientific Symposium, URSI

Stimulation of deeper brain structures by transcranial magnetic stimulation (TMS) plays a role in the study of reward and motivation mechanisms, which may be beneficial in the treatment of several neurological and psychiatric disorders. This paper presents numerical simulation of deep transcranial magnetic stimulation (dTMS) by considering double cone, H-, Halo- and multiple concentric circular (MCC) coils. 3D distributions of the induced electric fields in realistic head models were calculated by impedance method and the results were compared with that of figure-of-eight (fo8) coil. Simulation results show that double cone and H-coils have significantly deep field penetration at the expense of induced higher and wider spread electrical fields in superficial cortical regions. The combination of Halo-coil with a conventional circular coil at the top of the head produce deeply penetrating electric field the same as double cone and H-coils, but the stimulation in superficial brain tissues are much lower. The MCC coils provide a flexible way to stimulate deep brain regions with improved focality.

关键词： Coils Magnetic heads Electric fields Head Magnetic stimulation Brain models

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Dependence of electromagnetic fields in human brain on coil bending angle in transcranial magnetic stimulation

Dependence of electromagnetic fields in human brain on coil ...

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General Assembly and Scientific Symposium, URSI

This paper presents numerical simulation of transcranial magnetic stimulation by employing figure-of-eight coil (fo8) with bending wings. Various fo8 coils with different bending angles were numerically designed. Three-dimensional distributions of the magnetic fields and induced electric fields in realistic head model were calculated by impedance method. Results were compared with those obtained from standard fo8 coil. Results show that either stimulation depth or focality is easily adjusted by changing the bending angle of coil wings. The fo8 coil with flexible folding wings can be served for providing controllab.e stimulation depth and focality in TMS applications.

关键词： Coils Electric fields Magnetic heads Magnetic stimulation Magnetic fields Standards Biological system modeling

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Dependence of induced electric fields in human brain on working frequency in transcranial magnetic stimulation

Dependence of induced electric fields in human brain on work...

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World Congress on Medical Physics and Biomedical Engineering

作者： Lu, Mai Ueno, Shoogo Key Lab. of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Lanzhou 730070 China Department of Applied Quantum Physics Graduate School of Engineering Kyushu University Fukuoka 812-8581 Japan

ISBN: (纸本)9783642293047

Transcranial magnetic stimulation could provide new, non-invasive therapeutic options for various psychiatric and neurological disorders. In this work, we study the dependence of induced electric fields on working frequency in real human brain by usage the conventional figure-of-eight and round coils. The induced electric fields in brain tissues were calculated by using impedance method. The thresholds for motor neural activation at different frequencies were calculated by considering the motor strength-duration curve. Comparison of the induced electric fields at 3.6 kHz, 18 kHz and 36 kHz have been performed. Numerical results show that the induced electric fields can be distributed in the deep brain regions by increasing the working frequency. Since the threshold for motor neural activation increases dramatically with the increase of working frequency, we suggest the TMS application with higher frequency should work at a frequency less than 40 kHz. © 2013 Springer-Verlag.

关键词： Chemical activation

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Calculating the Electric Fields in the Human Brain by Deep Transcranial Magnetic Stimulation

Calculating the Electric Fields in the Human Brain by Deep T...

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URSI Commission B International Symposium on Electromagnetic Theory

作者： Mai Lu Shoogo Ueno Key Lab. of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Department of Applied Quantum Physics Graduate School of Engineering Kyushu University

ISBN: (纸本)9781467349390

Stimulation of deeper brain structures by transcranial magnetic stimulation (TMS) may be beneficial in the treatment of several neurological and psychiatric disorders. This paper presents numerical simulation of deep transcranial magnetic stimulation (dTMS) by considering double cone, H- and Halo coils. Three-dimensional distributions of the induced electric fields in realistic head model by dTMS coils were calculated by impedance method and the results were compared with that of standard figure-of-eight coil. Simulation results show that double cone and H-coils have significantly deep field penetration at the expense of induced higher and wider spread electrical fields in superficial cortical regions. The combination of Halo coil with a conventional circular coil produce deeply penetrating electric field the same as double cone and H-coils, but the stimulation in superficial brain tissues are much lower.

关键词： Coils Magnetic stimulation Magnetic heads Head Solid modeling Numerical models Impedance measurement

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Calculating the Induced Electromagnetic Fields in Real Human Head by Deep Transcranial Magnetic Stimulation

Calculating the Induced Electromagnetic Fields in Real Human...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

ISBN: (纸本)9781457702150

Stimulation of deeper brain structures by transcranial magnetic stimulation (TMS) may be beneficial in the treatment of several neurological and psychiatric disorders. This paper presents numerical simulation of deep transcranial magnetic stimulation (dTMS) by considering double cone, H-and Halo coils. Three-dimensional distributions of the induced fields i.e. magnetic flux density, current density and electric fields in realistic head model by dTMS coils were calculated by impedance method and the results were compared with that of figure-of-eight coil. It was found that double cone and H-coils have significantly deep field penetration at the expense of induced higher and wider spread electrical fields in superficial cortical regions. The Halo coil working with a circular coil carrying currents in opposite directions provides a flexible way to stimulate deep brain structures with much lower stimulation in superficial brain tissues.

关键词： Double Cone Transcranial Magnetic Stimulation haloes Coils Characteristic impedance Stimuli Electric fields Electromagnetic fields induction field Head numerical simulation

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Calculating the Induced Electric Fields in Real Human Head by Transcranial Magnetic Stimulation Using Coil Array

Calculating the Induced Electric Fields in Real Human Head b...

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第七届电磁辐射与健康国际研讨会

作者： Mai Lu Shoogo Ueno Key Lab of Opt-Electronic Technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong University Lanzhou 730070 P.R.China Department of Applied Quantum Physics Graduate School of Engineering Kyushu University Fukuoka 812-8581 Japan

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