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Efficient Electric Field Simulations for Transcranial Brain Stimulation [article]

Guilherme Bicalho Saturnino, Kristoffer Hougaard Madsen, Axel Thielscher
2019 bioRxiv   pre-print
Main results: Comparisons with analytical solutions for spherical head models validate our new FEM implementation. It is five to ten times faster than previous implementations.  ...  Numerical simulations based on anatomically detailed head models of the TMS and TES electric fields can help us to understand and optimize the spatial stimulation pattern in the brain.  ...  The copyright holder for this preprint (which . http://dx.doi.org/10.1101/541409 doi: bioRxiv preprint first posted online Feb. 5, 2019;  ... 
doi:10.1101/541409 fatcat:h7npyq6ovzaebgg2qpclhiwpvi

Electric field simulations for transcranial brain stimulation using FEM: an efficient implementation and error analysis

Guilherme Bicalho Saturnino, Kristoffer Hougaard Madsen, Axel Thielscher
2019 Journal of Neural Engineering  
Numerical simulations based on anatomically detailed head models of the TMS and TES electric fields can help us to understand and optimize the spatial stimulation pattern in the brain.  ...  Transcranial magnetic stimulation (TMS) and transcranial electric stimulation (TES) modulate brain activity non-invasively by generating electric fields either by electromagnetic induction or by injecting  ...  magnetic stimulation (TMS) and transcranial weak electric stimulation (TES) are the two best-established methods for non-invasive transcranial brain stimulation (TBS).  ... 
doi:10.1088/1741-2552/ab41ba pmid:31487695 fatcat:w4dyidydnzgy5fpb56shxc4kxi

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  
For the sake of realizing MTI stimulation, we proposed the scheme with each electrode carrying different frequency currents, which has higher usability with respect to the scheme by adding more electrode  ...  Recently, a novel technology for noninvasive deep brain stimulation (NDBS) with temporally interfering electric fields was developed.  ...  Noninvasive electrical brain stimulation mainly involves two methods: transcranial direct current stimulation (tDCS) and transcranial alternating current stimulation (tACS). tDCS uses a constant, low direct  ... 
doi:10.1109/access.2019.2947857 fatcat:vhl37k2dozdehnqj2hu6hrtfnm

Determination of optimal electrode positions for transcranial direct current stimulation (tDCS)

Chang-Hwan Im, Hui-Hun Jung, Jung-Do Choi, Soo Yeol Lee, Ki-Young Jung
2008 Physics in Medicine and Biology  
The present study introduces a new approach to determining optimal electrode positions in transcranial direct current stimulation (tDCS).  ...  The electrode positions for minimal current injection were optimized by changing the Cartesian coordinate system into the spherical coordinate system and applying the (2+6) evolution strategy (ES) algorithm  ...  Acknowledgments We thank the anonymous reviewers for constructive comments to the original version of the manuscript.  ... 
doi:10.1088/0031-9155/53/11/n03 pmid:18490807 fatcat:4yh5snssafhtnkgfuntmbomh54

In vivo assessment of human brain oscillations during application of transcranial electric currents

Surjo R. Soekadar, Matthias Witkowski, Eliana G. Cossio, Niels Birbaumer, Stephen E. Robinson, Leonardo G. Cohen
2013 Nature Communications  
This new method allows for the first time direct measurement of the effects of non-invasive electrical brain stimulation on brain oscillatory activity and behavior.  ...  However, the direct effects of these currents on brain oscillations have remained an enigma because of the inability to record them simultaneously.  ...  Electric brain stimulation. Direct current was applied to the phantom head using a commercial and a prototype stimulator (NeuroConn GmbH, Ilmenau, Germany).  ... 
doi:10.1038/ncomms3032 pmid:23787780 pmcid:PMC4892116 fatcat:gwcvfgksfnhdbczqf6cezmtw7u

Review on Biophysical Modelling and Simulation Studies for Transcranial Magnetic Stimulation [article]

Jose Gomez-Tames, Ilkka Laakso, Akimasa Hirata
2020 arXiv   pre-print
Transcranial magnetic stimulation (TMS) is a technique for noninvasively stimulating a brain area for therapeutic, rehabilitation treatments and neuroscience research.  ...  These efforts, together with the fast deployment of personalised TMS computations, will permit the adoption of TMS dosimetry as a standard procedure in clinical procedures.  ...  Introduction Transcranial magnetic stimulation (TMS) is a technique for noninvasively stimulating a target area of the brain.  ... 
arXiv:2007.00469v1 fatcat:hkzdpaipcjbnbow4xjezrqabcy

Ultrasound Axicon: Systematic Approach to Optimize Focusing Resolution through Human Skull Bone

Fabián Acquaticci, Sergio E. Lew, Sergio N. Gwirc
2019 Materials  
MHz, that is within the range of optimal frequencies for transcranial transmission.  ...  The skull is not an obstacle for focusing of ultrasound with optimized axicon lenses that achieve an identical resolution to spherical transducers, but with the advantage that the focusing distance is  ...  In this work, we also characterized the acoustic pressure amplitude of the beam pattern of the axicon lens when FUS was transmitted through a human skull phantom for experimental validation of simulated  ... 
doi:10.3390/ma12203433 pmid:31635195 pmcid:PMC6829233 fatcat:qunh3kjbmzg2nauzmlwdqb6uzy

Noninvasive Deep Brain Stimulation via Temporally Interfering Electric Fields

Nir Grossman, David Bono, Nina Dedic, Suhasa B. Kodandaramaiah, Andrii Rudenko, Ho-Jun Suk, Antonino M. Cassara, Esra Neufeld, Niels Kuster, Li-Huei Tsai, Alvaro Pascual-Leone, Edward S. Boyden
2017 Cell  
These analyses were conducted with a cylindrical phantom, but similar field distributions were obtained in simulations with a spherical phantom ( Figures S2G-S2L) .  ...  (G) to (L) Spherical phantom model. The phantom model was a conductive sphere with a 50 mm diameter.  ...  for a detailed description of the phantom measurement).  ... 
doi:10.1016/j.cell.2017.05.024 pmid:28575667 pmcid:PMC5520675 fatcat:x5ezwru2bbc6bheo5doizk4qb4

3D modeling of the total electric field induced by transcranial magnetic stimulation using the boundary element method

F S Salinas, J L Lancaster, P T Fox
2009 Physics in Medicine and Biology  
Transcranial magnetic stimulation (TMS) delivers highly localized brain stimulations via noninvasive externally applied magnetic fields.  ...  The direction of the secondary E-field was generally in opposition to the primary E-field; however, for some locations, this was not the case (i.e. going from high to low conductivity tissues).  ...  We would like to thank John Roby and Wei Zhang for their assistance in probe fabrication and data acquisition.  ... 
doi:10.1088/0031-9155/54/12/002 pmid:19458407 pmcid:PMC5293006 fatcat:s2lkipz6mnfgtovtfhbnvnx6la

Using reciprocity for relating the simulation of transcranial current stimulation to the EEG forward problem [article]

Sven Wagner, Felix Lucka, Johannes Vorwerk, Christoph Herrmann, Guido Nolte, Martin Burger, Carsten H. Wolters
2016 bioRxiv   pre-print
We then demonstrate how the quasi-analytical EEG forward solutions in sphere models can be used to validate the numerical accuracies of FEM-based tCS simulation approaches.  ...  To explore the relationship between transcranial current stimulation (tCS) and the electroencephalography (EEG) forward problem, we investigate and compare accuracy and efficiency of a reciprocal and a  ...  Acknowledgement This work has been supported by the priority program SPP1665 of the German Research Foundation, projects WO1425/5-1 (for SW, FL, JV, MB and CHW), HE3353/8-1 (for CSH) and EN533/13-1 (for  ... 
doi:10.1101/043554 fatcat:mgbywr225ng77mcbhwaoiyznjq

Using reciprocity for relating the simulation of transcranial current stimulation to the EEG forward problem

S. Wagner, F. Lucka, J. Vorwerk, C.S. Herrmann, G. Nolte, M. Burger, C.H. Wolters
2016 NeuroImage  
We then demonstrate how the quasi-analytical EEG forward solutions in sphere models can be used to validate the numerical accuracies of FEM-based tCS simulation approaches.  ...  implement and topologically less Keywords: Transcranial current stimulation, EEG forward problem, reciprocity, finite element method, validation in multilayer sphere model, evaluation in realistic head  ...  Acknowledgement This work has been supported by the priority program SPP1665 of the German Research Foundation, projects WO1425/5-1 (for SW, FL, JV, MB and CHW), HE3353/8-1 (for CSH) and EN533/13-1 (for  ... 
doi:10.1016/j.neuroimage.2016.04.005 pmid:27125841 fatcat:34zny6sxs5hhdipxg6utc3w3lu

Considerations for ultrasound exposure during transcranial MR acoustic radiation force imaging

M. Anthony Phipps, Sumeeth V. Jonathan, Pai-Feng Yang, Vandiver Chaplin, Li Min Chen, William A. Grissom, Charles F. Caskey
2019 Scientific Reports  
This method was validated in phantoms, which showed that MR-ARFI-derived displacement sensitivity is maximized when the MR-ARFI MEGs were maximally aligned with the FUS propagation direction.  ...  The methods presented here will benefit the multitude of transcranial FUS applications as well as future human applications.  ...  We would also like to acknowledge expert assistance from George Wilson and Chaohui Tang for animal handling support, and Tom Manuel for assistance with computer-aided design.  ... 
doi:10.1038/s41598-019-52443-8 pmid:31700021 pmcid:PMC6838326 fatcat:gc63ki2otjfsfbtp2lowg2ikse

The electric field induced by transcranial magnetic stimulation: A comparison between analytic and fem solutions

Konstantin Porzig, Hartmut Brauer, Hannes Toepfer
2014 Serbian Journal of Electrical Engineering  
the humans head, as in the case of deep brain transcranial magnetic stimulation (dTMS).  ...  The induced electric field profiles in a homogeneous isotropic sphere, were calculated and compared between an analytic and a finite-element method in the framework of transcranial magnetic stimulation  ...  Acknowledgement We want to thank Sylvi Herzog most sincerly for numerious X-rays of our TMS coils and Lawrence Crowther together with Marek Ziolkowski for fruitful scientific discussions and all other  ... 
doi:10.2298/sjee140908029p fatcat:m44k76xx65gmro4gqpsmvdyxnm

A novel 3D-printed head phantom with anatomically realistic geometry and continuously varying skull resistivity distribution for electrical impedance tomography

Jie Zhang, Bin Yang, Haoting Li, Feng Fu, Xuetao Shi, Xiuzhen Dong, Meng Dai
2017 Scientific Reports  
brain function research, such as transcranial direct current stimulation (TDCS) and electroencephalography (EEG).  ...  The validation results demonstrated that the resistivity of the phantom was in good agreement with that of human tissue and was stable over time, and the new phantom performed well in EIT imaging.  ...  This work was supported by the National Natural Science Foundation of China under Grant 31600799.  ... 
doi:10.1038/s41598-017-05006-8 pmid:28676697 pmcid:PMC5496891 fatcat:xxooanb7wzbq3fjavo3etrz4jm

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.  ...  Tanghe is a postdoctoral fellow of the Research Foundation-Flanders (FWO-V).  ... 
doi:10.1155/2018/7061420 pmid:29967781 pmcid:PMC6008619 fatcat:jcuza7sqbbhxba7fhs34zvkyla
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