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Related Experiment Video

Updated: Nov 5, 2025

Investigating the Function of Deep Cortical and Subcortical Structures Using Stereotactic Electroencephalography: Lessons from the Anterior Cingulate Cortex
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Gray Matter Sampling Differences Between Subdural Electrodes and Stereoelectroencephalography Electrodes.

Mohamed Tantawi1,2, Jingya Miao1,2, Caio Matias1,2

  • 1Department of Radiology, Jefferson Integrated Magnetic Resonance Imaging Center, Thomas Jefferson University, Philadelphia, PA, United States.

Frontiers in Neurology
|May 14, 2021
PubMed
Summary
This summary is machine-generated.

Stereoelectroencephalography (SEEG) and subdural electrode (SDE) implants offer similar per-contact gray matter volumes. However, SEEG provides greater total coverage, especially within sulci and the insula, making it suitable for diverse epilepsy monitoring needs.

Keywords:
depth electrodesepileptogenic zoneintracranial electrodesintracranial monitoringstereoelectroencephalographysubdural grid

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Area of Science:

  • Neurosurgery
  • Epilepsy Monitoring
  • Neuroimaging

Background:

  • Stereoelectroencephalography (SEEG) use is increasing in North America.
  • Concerns exist regarding the spatial sampling capabilities of SEEG.
  • Subdural electrode (SDE) implants are an alternative for invasive epilepsy monitoring.

Purpose of the Study:

  • To quantify and compare the spatial sampling of SEEG versus SDE implants.
  • To evaluate differences in gray matter volume and distribution coverage.
  • To inform the selection of appropriate invasive monitoring techniques.

Main Methods:

  • Retrospective case-control study comparing 10 SEEG and 10 matched SDE cases.
  • 3D reconstruction of electrode contacts using coregistered MR/CT images.
  • Quantification of gray matter volume using a 2.5mm radius sphere model per contact.
  • Ripley's K-function analysis for spatial distribution comparison.

Main Results:

  • Individual electrode contacts showed similar gray matter recording volumes for SEEG and SDE.
  • SEEG implants sampled 20% more total gray matter and had 17% more contacts.
  • SEEG achieved 77% greater coverage within sulci and was the only modality to cover the insula.

Conclusions:

  • SEEG and SDE offer comparable per-contact recording volumes.
  • SEEG enables greater overall gray matter sampling, particularly in sulci and the insula.
  • The choice between SEEG and SDE depends on specific patient sampling requirements.