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A high-resolution computational localization method for transcranial magnetic stimulation mapping.

Shinta Aonuma1, Jose Gomez-Tames1, Ilkka Laakso2

  • 1Nagoya Institute of Technology, Department of Electrical and Mechanical Engineering, Nagoya, Aichi, 466-8555, Japan.

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|January 24, 2018
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Summary
This summary is machine-generated.

This study presents a new Transcranial Magnetic Stimulation (TMS) method for precise brain motor area localization. The technique accurately maps motor function hotspots, improving brain mapping accuracy.

Keywords:
Brain mappingBrain tumorDirect electrical stimulationHotspotTranscranial magnetic stimulationVolume conductor model

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Computational Biology

Background:

  • Transcranial Magnetic Stimulation (TMS) is crucial for mapping brain motor functions.
  • Brain complexity and simplified methods hinder precise stimulation site localization.
  • Conventional computational approaches also face challenges in accurate localization.

Purpose of the Study:

  • To introduce a high-precision localization method for specific motor areas using synthesized non-uniform current distributions in the brain.
  • To improve the accuracy of Transcranial Magnetic Stimulation (TMS) for brain motor mapping.
  • To develop a method for precise localization of brain motor areas.

Main Methods:

  • Peritumoral mapping using TMS was performed on patients with brain neoplasms near the motor speech area.
  • Realistic head models from MRI scans were used to compute TMS-induced electric fields.
  • A post-processing method combined computed electric fields to determine TMS hotspots, validated against direct brain stimulation and navigated TMS.

Main Results:

  • The study evaluated the hotspot area's dependence on peritumoral measurements.
  • Estimated hand motor area localization in non-affected hemispheres agreed with the "hand-knob" position.
  • Estimated hotspot areas showed no sensitivity to tissue conductivity variations.
  • Hand motor areas estimated by the proposed method and direct electric stimulation (DES) showed good agreement in glioma patients.

Conclusions:

  • The TMS localization method was validated using known "hand-knob" positions in non-affected hemispheres.
  • The method was further validated by comparing hotspots localized via DES during awake craniotomy.
  • The developed method offers a validated approach for precise brain motor area localization.