Evidence map›Paper›PMID 31604625›Full record

ArticleBrain stimulation

Conditions for numerically accurate TMS electric field simulation.

Luis J Gomez, Moritz Dannhauer, Lari M Koponen, Angel V Peterchev

Abstract read
In one paragraph

Article in Brain stimulation. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 49 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
49citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

49 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Review
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  12. A survey on integral equations for bioelectric modeling.Physics in medicine and biology · 2024
    Review
  13. Article
  14. Quasistatic approximation in neuromodulation.Journal of neural engineering · 2024
    Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Luis J GomezDepartment of Psychiatry and Behavioral Sciences, Duke University, Durham, NC, 27710, USA. Electronic address: ljg24@duke.edu.
Moritz DannhauerDepartment of Psychiatry and Behavioral Sciences, Duke University, Durham, NC, 27710, USA. Electronic address: moritz.dannhauer@duke.edu.
Lari M KoponenDepartment of Psychiatry and Behavioral Sciences, Duke University, Durham, NC, 27710, USA. Electronic address: lari.koponen@duke.edu.
Angel V PeterchevDepartment of Psychiatry and Behavioral Sciences, Duke University, Durham, NC, 27710, USA; Department of Electrical and Computer Engineering, Duke University, Durham, NC, 27708, USA; Department of Neurosurgery, Duke University, Durham, NC, 27710, USA; Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA. Electronic address: angel.peterchev@duke.edu.

Funding

Rational Design of TMS for NeuromodulationR01NS088674 · NINDS · DUKE UNIVERSITY · PI PETERCHEV, ANGEL V, SOMMER, MARC A · 2014 to 2018
$3.1M
Impact of Timing, Targeting, and Brain State on rTMS of Human and Non-Human PrimatesRF1MH114253 · NIMH · DUKE UNIVERSITY · PI SOMMER, MARC A · 2017 to 2017
$3.0M
Using fMRI-guided TMS to increase central executive function in older adults - Administrative SupplementU01AG050618 · NIA · DUKE UNIVERSITY · PI APPELBAUM, LAWRENCE G., CABEZA, ROBERTO · 2016 to 2019
$2.3M
Transcranial magnetic stimulation with enhanced focality and depth (fdTMS)RF1MH114268 · NIMH · DUKE UNIVERSITY · PI PETERCHEV, ANGEL V · 2017 to 2017
$1.6M
Accurate and reliable computational dosimetry and targeting for transcranial magnetic stimulationR00MH120046 · NIMH · PURDUE UNIVERSITY · PI GOMEZ, LUIS JAVIER · 2020 to 2022
$676k
Accurate and reliable computational dosimetry and targeting for transcranial magnetic stimulationK99MH120046 · NIMH · DUKE UNIVERSITY · PI GOMEZ, LUIS JAVIER · 2019 to 2020
$168k
NIA NIH HHS U01 AG050618NIMH NIH HHS K99 MH120046NIMH NIH HHS R00 MH120046NIMH NIH HHS RF1 MH114253NIMH NIH HHS RF1 MH114268NINDS NIH HHS R01 NS088674
6 · The paper itself

Abstract

backgroundComputational simulations of the E-field induced by transcranial magnetic stimulation (TMS) are increasingly used to understand its mechanisms and to inform its administration. However, characterization of the accuracy of the simulation methods and the factors that affect it is lacking.

objectiveTo ensure the accuracy of TMS E-field simulations, we systematically quantify their numerical error and provide guidelines for their setup.

methodWe benchmark the accuracy of computational approaches that are commonly used for TMS E-field simulations, including the finite element method (FEM) with and without superconvergent patch recovery (SPR), boundary element method (BEM), finite difference method (FDM), and coil modeling methods.

resultsTo achieve cortical E-field error levels below 2%, the commonly used FDM and 1st order FEM require meshes with an average edge length below 0.4 mm, 1st order SPR-FEM requires edge lengths below 0.8 mm, and BEM and 2nd (or higher) order FEM require edge lengths below 2.9 mm. Coil models employing magnetic and current dipoles require at least 200 and 3000 dipoles, respectively. For thick solid-conductor coils and frequencies above 3 kHz, winding eddy currents may have to be modeled.

conclusionBEM, FDM, and FEM all converge to the same solution. Compared to the common FDM and 1st order FEM approaches, BEM and 2nd (or higher) order FEM require significantly lower mesh densities to achieve the same error level. In some cases, coil winding eddy-currents must be modeled. Both electric current dipole and magnetic dipole models of the coil current can be accurate with sufficiently fine discretization.

Indexed as

Computer SimulationPractice Guidelines as TopicCalibrationCortical ExcitabilityElectromagnetic FieldsFinite Element AnalysisHumansTranscranial Magnetic StimulationBoundary element methodElectric field simulationFinite element methodTMSTranscranial magnetic stimulation

Identifiers

PMID31604625
PMCPMC6888902

What OpenQuestion holds

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LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.