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Best Current Practice for Obtaining High Quality EEG Data During Simultaneous fMRI
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Detecting sub-second changes in brain activation patterns during interictal epileptic spike using simultaneous

Epifanio Bagarinao1, Satoshi Maesawa2, Yuji Ito3

  • 1Brain and Mind Research Center, Nagoya University, Nagoya, Aichi, Japan.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|December 31, 2017
PubMed
Summary

This study used simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) to map brain activity during epileptic spikes. The novel SSWAS map method successfully identified epileptic foci, improving detection rates compared to conventional analysis.

Keywords:
Electroencephalography (EEG)EpilepsyFunctional magnetic resonance imaging (fMRI)Simultaneous EEG-fMRISub-second activation dynamics

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Epilepsy Research

Background:

  • Epileptic spikes involve dynamic brain activation across networks.
  • Understanding these changes requires high temporal and spatial resolution.
  • Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) offer complementary data.

Purpose of the Study:

  • To resolve rapid brain activation changes during epileptic spikes.
  • To evaluate a novel analysis method for simultaneous EEG-fMRI data.
  • To improve the identification of epileptic foci.

Main Methods:

  • Simultaneous EEG-fMRI recordings from 9 epilepsy patients.
  • Utilized whole-scalp EEG data to generate general linear model regressors for fMRI analysis.
  • Developed and applied SSWAS (Spike-and-Slow-Wave) summary maps.

Main Results:

  • Resolved millisecond-level brain activation changes in epileptic networks during spikes.
  • SSWAS maps revealed significant activation in suspected epileptic foci.
  • SSWAS maps improved epileptic foci detection in 4 out of 5 patients where conventional methods failed.

Conclusions:

  • The developed method effectively resolves brain activation changes during epileptic spikes.
  • SSWAS maps demonstrate efficacy in identifying epileptic foci.
  • This approach offers potential insights into epilepsy pathophysiology.