Journal ArticleDOI
How the brain tissue shapes the electric field induced by transcranial magnetic stimulation.
TLDR
The field induced by a figure-8 coil is characterized in detail using finite element calculations and a geometrically accurate model of an individual head combined with high-resolution diffusion-weighted imaging for conductivity mapping and demonstrates the necessity of using realistic nerve models in the future to allow for more definitive conclusions.About:
This article is published in NeuroImage.The article was published on 2011-10-01. It has received 286 citations till now. The article focuses on the topics: Field strength.read more
Citations
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Journal ArticleDOI
Electric field depth-focality tradeoff in transcranial magnetic stimulation: simulation comparison of 50 coil designs.
TL;DR: The ability to directly stimulate deeper brain structures is obtained at the expense of inducing wider electrical field spread, and novel coil designs should be benchmarked against comparison coils with consistent metrics such as d( 1/2) and S(1/2).
Journal ArticleDOI
Transcranial focused ultrasound modulates the activity of primary somatosensory cortex in humans
Wynn Legon,Tomokazu F. Sato,Alexander Opitz,Jerel K. Mueller,Aaron J. Barbour,Amanda J. Williams,William J. Tyler +6 more
TL;DR: It is concluded that transcranial focused ultrasound (tFUS) targeted to the human primary somatosensory cortex can be used to focally modulate human cortical function.
Proceedings ArticleDOI
Field modeling for transcranial magnetic stimulation: A useful tool to understand the physiological effects of TMS?
TL;DR: A new version of the pipeline for field calculations that substantially simplifies setting up and running TMS and tDCS simulations based on Finite-Element Methods (FEM) is introduced.
Journal ArticleDOI
Determinants of the electric field during transcranial direct current stimulation
Alexander Opitz,Alexander Opitz,Alexander Opitz,Walter Paulus,Susanne Will,Andre Antunes,Axel Thielscher +6 more
TL;DR: How various anatomical features systematically shape the electric field distribution in the brain during tDCS is shown, namely the thicknesses of the cerebrospinal fluid and the skull, the gyral depth and the distance to the anode and cathode.
Journal ArticleDOI
Electric field calculations in brain stimulation based on finite elements: an optimized processing pipeline for the generation and usage of accurate individual head models.
TL;DR: An optimized processing pipeline is introduced allowing for the automatic generation of individualized high‐quality head models from magnetic resonance images and their usage in subsequent field calculations based on the FEM, allowing the first time to perform realistic field calculations at an acceptable methodological complexity and moderate costs.
References
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Advances in functional and structural MR image analysis and implementation as FSL.
Stephen M. Smith,Mark Jenkinson,Mark W. Woolrich,Mark W. Woolrich,Christian F. Beckmann,Behrens Tej.,Heidi Johansen-Berg,Peter R. Bannister,M De Luca,Ivana Drobnjak,D E Flitney,Rami K. Niazy,J Saunders,J Vickers,Yongyue Zhang,N. De Stefano,J M Brady,Paul M. Matthews +17 more
TL;DR: A review of the research carried out by the Analysis Group at the Oxford Centre for Functional MRI of the Brain (FMRIB) on the development of new methodologies for the analysis of both structural and functional magnetic resonance imaging data.
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Cortical surface-based analysis. I. Segmentation and surface reconstruction
TL;DR: A set of automated procedures for obtaining accurate reconstructions of the cortical surface are described, which have been applied to data from more than 100 subjects, requiring little or no manual intervention.
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Spin diffusion measurements : spin echoes in the presence of a time-dependent field gradient
E. O. Stejskal,J. E. Tanner +1 more
TL;DR: In this article, a derivation of the effect of a time-dependent magnetic field gradient on the spin-echo experiment, particularly in the presence of spin diffusion, is given.
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Cortical Surface-Based Analysis II: Inflation, Flattening, and a Surface-Based Coordinate System
TL;DR: A set of procedures for modifying the representation of the cortical surface to inflate it so that activity buried inside sulci may be visualized, cut and flatten an entire hemisphere, and transform a hemisphere into a simple parameterizable surface such as a sphere for the purpose of establishing a surface-based coordinate system are designed.
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MR diffusion tensor spectroscopy and imaging.
TL;DR: Once Deff is estimated from a series of NMR pulsed-gradient, spin-echo experiments, a tissue's three orthotropic axes can be determined and the effective diffusivities along these orthotropic directions are the eigenvalues of Deff.