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Related Experiment Video

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Ictal EEG Source Imaging With Supplemental Electrodes.

Deanne Kennedy Loube1, Yee-Leng Tan2, June Yoshii-Contreras3

  • 1Department of Neurology, Stanford University, Palo Alto, California, U.S.A.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
|October 11, 2023
PubMed
Summary
This summary is machine-generated.

Ictal EEG source imaging (ESI) accurately localizes seizures in epilepsy surgery candidates, showing high concordance with intracranial EEG. This noninvasive method supports routine clinical use in presurgical evaluations.

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Epileptology

Background:

  • Noninvasive brain imaging is crucial for guiding decisions in epilepsy surgery evaluations.
  • Intracranial electroencephalogram (ICEEG) is an invasive, costly standard for presurgical epilepsy assessment.
  • This study prospectively compares ictal EEG source imaging (ESI) with ICEEG.

Purpose of the Study:

  • To evaluate the concordance in seizure localization between ictal EEG source imaging (ESI) and intracranial electroencephalogram (ICEEG).
  • To assess the accuracy of ESI as a noninvasive tool in presurgical epilepsy evaluation.
  • To determine the clinical utility of ESI in identifying seizure onset zones.

Main Methods:

  • 104 patients with intractable focal epilepsy undergoing video monitoring were screened.
  • 31-38 scalp electrodes were placed over suspected seizure onset regions in 104 patients.
  • 30 patients with sufficiently localized intracranial studies were compared using ESI and ICEEG, with ESI employing realistic boundary element models.

Main Results:

  • 97% of cases showed at least partial sublobar concordance between ESI and ICEEG.
  • 73% of cases achieved complete agreement in seizure localization.
  • Distributed source analysis with 31+ electrodes was significantly more accurate than with 21 electrodes (P < 0.01).

Conclusions:

  • Ictal ESI using a practical, nonuniform electrode placement (31-38 electrodes) demonstrates high accuracy for seizure localization.
  • The findings support the routine clinical application of ESI in epilepsy surgery candidates.
  • ESI offers a reliable noninvasive alternative for guiding presurgical epilepsy evaluations.