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The 5th International Conference on Biomedical Engineering and Biotechnology (ICBEB 2016) Abstracts

BMC MEDICAL IMAGING 2016年第SUPPL 1期16卷 65-65页

作者： [Anonymous] Department of MRI Shandong Medical Imaging Research Institute Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China Department of Interventional Radiology Shandong Provincial Hospital Affiliated to Shandong University Jinan Shandong 250021 People’s Republic of China College of Information Science and Technology Engr. Research Center of Digitized Textile & Fashion Tech. for Ministry of Education Donghua University Shanghai 201620 China Intelligent multimedia information processing Lab College of Software Northeastern University Shenyang Liaoning Province 110004 China Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China School of Computer Science and Technology Nanjing Normal University Nanjing China Department of Electrical Engineering The City College of New York CUNY New York USA Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing China School of Electronic Science and Engineering Nanjing University Nanjing Jiangsu 210046 China College of Engineering Nanyang Technological University Singapore 639798 Singapore School of Electronic Information Shanghai Dianji University Shanghai China School of Natural Sciences and Mathematics Shepherd University Shepherdstown WV 25443 USA Davis College of Agriculture Natural Resources and Design West Virginia University Morgantown WV 26505 USA State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China Center of Medical Physics and Technology Hefei Institutes of Physical Science Chinese Academy of Sciences Hefei China College of Agricultural and Life Sciences University of Florida Gainesville FL 32611 USA Courant Institute of Mathematical Sciences New York University New York NY 10012 USA Translational Imaging Division & MRI Unit Columbia University and New York State Psychiatric Institute New York NY 10032 USA Guangxi Key Laboratory of Manufacturing System & Adv

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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 controllable 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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Depemdence of Specific Absorption Rate on the Size of the Head Model in Mobile Phone Dosimetry

Depemdence of Specific Absorption Rate on the Size of the He...

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第七届电磁辐射与健康国际研讨会

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Dosimetry of Typical electronic Article Surveillance Device with Multi-Guards

Dosimetry of Typical Electronic Article Surveillance Device ...

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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 Mikael Persson 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 Department of Signals and Systems Chalmers University of Technology SE-412 96 Gothenburg Sweden

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