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GridLoc: An automatic and unsupervised localization method for high-density ECoG grids.

Mariana P Branco1, Michael Leibbrand1, Mariska J Vansteensel1

  • 1Brain Center Rudolf Magnus, Department of Neurology and Neurosurgery, University Medical Center Utrecht, Utrecht, The Netherlands.

Neuroimage
|June 20, 2018
PubMed
Summary
This summary is machine-generated.

A new method, GridLoc, automatically localizes high-density electrocorticography (HD-ECoG) electrode grids using brain signal patterns. This technique bypasses the need for post-operative imaging, simplifying electrode localization during acute measurements.

Keywords:
AngiogramCortical distanceElectrocorticographyElectrode localizationHigh-densityHigh-frequency bandResting-stateUnsupervised

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Signal Processing

Background:

  • Accurate localization of high-density electrocorticography (HD-ECoG) electrodes is crucial for interpreting brain activity relative to functional anatomy.
  • Current methods rely on post-operative imaging, which is unavailable during acute measurements or awake surgery.
  • Intra-operative photographs are limited for electrodes under the skull.

Purpose of the Study:

  • To develop an automatic, unsupervised method for localizing HD-ECoG electrode grids without post-operative imaging.
  • To investigate if resting-state high-frequency band power patterns correlate with underlying brain structures for localization.
  • To validate the GridLoc method against established localization techniques.

Main Methods:

  • Developed GridLoc, an automatic and unsupervised localization method for HD-ECoG grids.
  • Utilized the hypothesis that brain structures (sulci, vasculature) influence ECoG signal amplitude.
  • Analyzed spatial correlation between resting-state high-frequency band power (45-120 Hz) and anatomical features.
  • Validated GridLoc in 8 patients by comparing results with post-operative imaging and/or photographs.

Main Results:

  • GridLoc achieved localization with an average difference of 1.94 ± 0.11 mm compared to post-operative imaging/photographs.
  • This accuracy is comparable to previously reported differences between imaging and photographic methods.
  • The study confirmed that resting-state high-frequency band activity patterns can effectively guide HD-ECoG electrode localization.

Conclusions:

  • GridLoc offers a convenient and accurate alternative for HD-ECoG electrode localization.
  • The method successfully localizes electrodes on pre-operative MRI scans without requiring post-operative imaging.
  • This advancement is particularly beneficial for acute measurements and awake surgeries where post-operative imaging is not feasible.