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Computation of electric and magnetic stimulation in human head using the 3-D impedance method

M. Nadeem, T. Thorlin, O.P. Gandhi, M. Persson
2003 IEEE Transactions on Biomedical Engineering  
A comparative, computational study of the modeling of transcranial magnetic stimulation (TMS) and electroconvulsive therapy (ECT) is presented using a human head model.  ...  Induced current densities and electric field distributions are calculated in the model using the impedance method.  ...  ACKNOWLEDGMENT The authors would like to thank Brooks Air Force Laboratory and the Visual Human project for providing the models.  ... 
doi:10.1109/tbme.2003.813548 pmid:12848358 fatcat:nz5usglmwzbqhhakm26ugfl3pm

A comparison of induced electric fields in child and adult head models by transcranial magnetic stimulation

Mai Lu, Shoogo Ueno
2011 2011 XXXth URSI General Assembly and Scientific Symposium  
The induced electric fields were calculated by impedance method and the results were compared with those obtained in an adult head model.  ...  In this paper, we present a numerical simulation of transcranial magnetic stimulation in a real 3D child head model by employing a realistic figure-of-eight coil.  ...  This work is also supported in part by the grant (S) 17100006 from Japan Society for the Promotion of Science (JSPS) granted to Shoogo Ueno.  ... 
doi:10.1109/ursigass.2011.6051391 fatcat:uau2puzpzvg6becduhz6pwmyvy

Multi-point temporal interference stimulation by using each electrode to carry different frequency currents

Xiaoqi Zhu, Youjun Li, Liang Zheng, Bixin Shao, Xun Liu, Chenxi Li, Zi-Gang Huang, Tian Liu, Jue Wang
2019 IEEE Access  
The MTI stimulation can be generated by our method with proper parameters in geometrical model, MRI human head model, and tissue phantom.  ...  Additionally, to optimize the MTI stimulation, we selected the proper current frequencies and amplitudes, which were verified by geometrical model, magnetic resonance imaging (MRI) human head model, and  ...  THE POTENTIAL APPLICATION OF MTI STIMULATION IN HUMAN HEAD AND BRAIN NETWORK Given that the human head is bigger than mouse/rat head, the MTI electric field is weaker in human head.  ... 
doi:10.1109/access.2019.2947857 fatcat:vhl37k2dozdehnqj2hu6hrtfnm

A Reconstruction Algorithm of Magnetoacoustic Tomography With Magnetic Induction for an Acoustically Inhomogeneous Tissue

Lian Zhou, Shanan Zhu, Bin He
2014 IEEE Transactions on Biomedical Engineering  
However, the tissue in most parts of human body, has heterogeneous acoustic properties, which leads to potential distortion and blurring of small buried objects in the impedance images.  ...  With a computer head model constructed from MR images of a human subject, a series of numerical simulation experiments were conducted.  ...  Acknowledgments This work was supported in part by NIH EB014353, EB017069, EB006433, HL117664, and NSF CBET-1264782.  ... 
doi:10.1109/tbme.2014.2304494 pmid:24845284 pmcid:PMC4058507 fatcat:rxaxfr7pabbq5jfegjb2gznca4

Safety Study of Combination Treatment: Deep Brain Stimulation and Transcranial Magnetic Stimulation

Hamzah Magsood, Farheen Syeda, Kathryn Holloway, Ivan C. Carmona, Ravi L. Hadimani
2020 Frontiers in Human Neuroscience  
However, the potential electromagnetic interactions of the strong magnetic fields from TMS on the conductive leads is unknown, and the combination therapy has not been approved for use.  ...  We fabricated an anatomically accurate head and brain phantom with electrical conductivities matching cerebrospinal fluid and averaged conductivity of gray and white matter.  ...  These shells were 3-D printed and were used as molds for the constituent material of the brain phantom. A conductive polymer composite was prepared to mimic the electrical conductivity of the brain.  ... 
doi:10.3389/fnhum.2020.00123 pmid:32317954 pmcid:PMC7147373 fatcat:p4mlesjs7famdkcf3hs6xsak6e

Imaging of current flow in the human head during transcranial electrical therapy

A.K. Kasinadhuni, A. Indahlastari, M. Chauhan, Michael Schär, T.H. Mareci, R.J. Sadleir
2017 Brain Stimulation  
Objective/Hypothesis-We present the first in vivo images of electric current density distributions within the brain in four subjects undergoing transcranial electrical stimulation.  ...  Recently developed MR electrical impedance tomography (MREIT) [9] methods make it possible to reconstruct conductivity and current density distributions in subjects using only one component (B z ) of magnetic  ...  Acknowledgments Thanks are due to Chris Saar, Kevin Castellano, Casey Weigel and Bakir Mousa, for their work in segmenting data used in computer simulations used as comparisons to experimental data.  ... 
doi:10.1016/j.brs.2017.04.125 pmid:28457836 pmcid:PMC5513732 fatcat:5zqyqzmfivhtncyxribh36bkgi

Effect of electrical conductivity uncertainty in the assessment of the electric fields induced in the brain by exposure to uniform magnetic fields at 50 Hz

Marco Soldati, Ilkka Laakso
2020 IEEE Access  
the boundary element method (BEM) [17] and the impedance method [18] .  ...  Figure 3 . 2 . 32 Example of (a) T1-and (b) T2-weighted magnetic resonance images of the head.  ... 
doi:10.1109/access.2020.3043602 fatcat:eeezx4w765bklhhf7nbx2cbxke

Improved Sensing Pulses for Increased Human Head Depth Measurement Sensitivity With Electrical Impedance Spectroscopy

Giorgio Bonmassar, Michael H. Lev
2013 IEEE Transactions on Biomedical Engineering  
Numerical results obtained using a realistic human head model confirm that two sequential SGF pulses at different energies can improve EIS depth sensitivity when used in a dual-energy subtraction scheme  ...  This paper describes an improved electrical impedance spectroscopy (EIS) stimulus paradigm, based on dual-energy pulses using the stochastic Gabor function (SGF) that may more sensitively assess deep brain  ...  Acknowledgments The authors would like to thank Dr. M. Iacono for her help with running the FDTD simulations.  ... 
doi:10.1109/tbme.2013.2280877 pmid:24043365 pmcid:PMC5292238 fatcat:onjsma6gpfaxrp5zkxu5g4mfwy

Advances in electrical impedance tomography-based brain imaging

Xi-Yang Ke, Wei Hou, Qi Huang, Xue Hou, Xue-Ying Bao, Wei-Xuan Kong, Cheng-Xiang Li, Yu-Qi Qiu, Si-Yi Hu, Li-Hua Dong
2022 Military Medical Research  
Electrical impedance tomography (EIT) is a functional imaging technique that measures the transfer impedances between electrodes on the body surface to estimate the spatial distribution of electrical properties  ...  Recent advances in the field of EIT are discussed in the context of epilepsy, stroke, brain injuries and edema, and other brain diseases.  ...  Acknowledgements The authors acknowledge Han-Bin Ma in CAS Key Laboratory of Bio-Medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences for his patient  ... 
doi:10.1186/s40779-022-00370-7 pmid:35227324 pmcid:PMC8883715 fatcat:vp76epwkhzbaxhasy2f23qomxa

An intra-neural microstimulation system for ultra-high field magnetic resonance imaging and magnetoencephalography

Paul M. Glover, Roger H. Watkins, George C. O'Neill, Rochelle Ackerley, Rosa Sanchez-Panchuelo, Francis McGlone, Matthew J. Brookes, Johan Wessberg, Susan T. Francis
2017 Journal of Neuroscience Methods  
participant comfort and safety. • Stimulating single mechanoreceptors evokes activity in 7 T fMRI and MEG. • Responses to unitary stimulation are shown for the first time in MEG.  ...  a c t Background: Intra-neural microstimulation (INMS) is a technique that allows the precise delivery of low-current electrical pulses into human peripheral nerves.  ...  We acknowledge the valuable assistance of Andrew Stuart and Alan Dorkes in the University of Nottingham electronics and mechanical workshops.  ... 
doi:10.1016/j.jneumeth.2017.07.016 pmid:28743633 pmcid:PMC5594527 fatcat:6w65lmilbbaq3omnmm56mu3bcm

Validation of Numerical Simulation for Subdural Cortical Stimulation - Using Spherical Phantoms and Anatomically Realistic Head Phantom

Jinmo Jeong, Donghyeon Kim, Sangdo Jeong, Euiheon Chung, Sung Chan Jun, Jong-Hyun Lee, Sohee Kim
2014 Proceedings of the International Conference on Bioinformatics Models, Methods and Algorithms  
For this, we modelled brains using simple computational models with 2 and 3 shells, with and without realistic head geometry, and performed numerical simulations using finite element method (FEM).  ...  We implanted stimulation electrodes in the head phantom, and measured the electric potential induced by the electrodes.  ...  ACKNOWLEDGEMENTS This work was supported by the Institute of Medical System Engineering (iMSE) in the GIST.  ... 
doi:10.5220/0004796801360141 dblp:conf/biostec/JeongKJCJLK14 fatcat:5j62ddpsqfeftlazmcuq2cbzu4

FDTD-based Transcranial Magnetic Stimulation model applied to specific neurodegenerative disorders

Félix Fanjul-Vélez, Irene Salas-García, Noé Ortega-Quijano, José Luis Arce-Diego
2015 Computer Methods and Programs in Biomedicine  
In this work, magnetic propagation in human head is modeled by Finite-Difference Time-Domain (FDTD) method, taking into account specific characteristics of Transcranial Magnetic Stimulation (TMS) in neurodegenerative  ...  The numerical method is applied to the analysis of magnetic radiation distribution in the brain using two realistic magnetic source models: a circular coil and a figure-8 coil commonly employed in TMS.  ...  Acknowledgements This work has been carried out with the support of San Cándido Foundation.  ... 
doi:10.1016/j.cmpb.2014.10.008 pmid:25453382 fatcat:cu36zne4hjc6vdj6o7gpktnttu

Deep Transcranial Magnetic Stimulation: Improved Coil Design and Assessment of the Induced Fields Using MIDA Model

Amine M. Samoudi, Emmeric Tanghe, Luc Martens, Wout Joseph
2018 BioMed Research International  
Stimulation of deep brain structures by transcranial magnetic stimulation (TMS) is a method for activating deep neurons in the brain and can be beneficial for the treatment of psychiatric and neurological  ...  Numerical simulations were performed using MIDA: a new multimodal imaging-based detailed anatomical model of the human head and neck.  ...  Acknowledgments The research was supported by COST Action BM1309 (COST EMF-MED) and the FWO G003415N Project. E. Tanghe is a postdoctoral fellow of the Research Foundation-Flanders (FWO-V).  ... 
doi:10.1155/2018/7061420 pmid:29967781 pmcid:PMC6008619 fatcat:jcuza7sqbbhxba7fhs34zvkyla

Dynamic Multi-Channel TMS With Reconfigurable Coil

Ruoli Jiang, B. H. Jansen, B. R. Sheth, Ji Chen
2013 IEEE transactions on neural systems and rehabilitation engineering  
With this hardware, researchers will be able to stimulate multiple brain sites in any temporal order in a trial. The system employs a wire-mesh coil, constructed using -and -directional wires.  ...  Here, we present a computer simulation and bench experiments that show the feasibility of the dynamically-reconfigurable coil.  ...  Simulation was performed using a rigorous 3-D impedance method based on a generalized version presented in [7] .  ... 
doi:10.1109/tnsre.2012.2226914 pmid:23193321 fatcat:54n7ajaqljh77gtsmcnpigiqji

Magnetically Induced Temporal Interference for Focal and Deep-Brain Stimulation

Zonghao Xin, Akihiro Kuwahata, Shuang Liu, Masaki Sekino
2021 Frontiers in Human Neuroscience  
In this study, we integrated the concept of temporal interference (TI) stimulation, which has been demonstrated as a non-invasive deep-brain stimulation method, with magnetic stimulation in a four-coil  ...  The major limitations of the methods, however, would be the considerable intensity and frequency of the input current, followed by the frustration in the thermal management of the hardware.  ...  MATERIALS AND METHODS Brain Model and Induced Electric Field During the simulation, the human head was modeled using a homogeneous hemisphere model with a radius of 10 cm.  ... 
doi:10.3389/fnhum.2021.693207 pmid:34646125 pmcid:PMC8502936 fatcat:yw4nvujdmnbfxo4ffixdb7dn2a
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