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iELVis: An open source MATLAB toolbox for localizing and visualizing human intracranial electrode data.

David M Groppe1, Stephan Bickel2, Andrew R Dykstra3

  • 1Department of Psychology, University of Toronto, Toronto, ON M5SSG3, Canada; Department of Neurosurgery, Hofstra Northwell School of Medicine, and Feinstein Institute for Medical Research, Manhasset, NY 11030, USA.

Journal of Neuroscience Methods
|February 14, 2017
PubMed
Summary

A new MATLAB toolbox, iELVis, accurately localizes intracranial electrodes and corrects for brain shift. This tool enhances human neuroscience research by improving electrode data analysis and visualization.

Keywords:
ECoGIntracranialNeuroimagingSoftwareStimulationiEEG

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Area of Science:

  • Human neuroscience
  • Neuroimaging
  • Computational neuroscience

Background:

  • Intracranial electrical recordings (iEEG) and brain stimulation (iEBS) are crucial for human neuroscience.
  • Accurate electrode localization is often a limitation due to a lack of specialized tools.
  • Existing methods do not adequately address post-implant anatomical changes.

Purpose of the Study:

  • To develop a MATLAB toolbox (iELVis) for precise intracranial electrode localization and visualization.
  • To provide tools for correcting electrode positions for post-implant brain shift.
  • To enhance the analysis and interpretation of iEEG and iEBS data.

Main Methods:

  • iELVis integrates existing software (BioImage Suite, FSL, FreeSurfer) for MRI segmentation and coregistration.
  • Manual identification of electrodes in post-implant neuroimaging.
  • Implements algorithms for brain shift correction and interactive 3D/2D visualization with functional neuroimaging overlays.
  • Localizes electrodes relative to atlases and enables cross-subject analysis.

Main Results:

  • Electrode localization and visualization take 30-60 minutes of user time and 12-24 hours of computer time per subject.
  • Demonstrated high concordance between iEEG, iEBS, and fMRI for mapping somatosensory cortex.
  • iELVis is the first public software to correct for brain shift, map to an average brain, and support neuroimaging overlays.

Conclusions:

  • iELVis significantly accelerates progress and improves the reliability of intracranial electrode research.
  • The software offers powerful interactive visualizations and extensive tutorial materials.
  • Freely available as part of the EpiSurg software project, promoting wider adoption and advancement.