Related Experiment Video
Updated: Oct 2, 2025
08:20
Brain Source Imaging in Preclinical Rat Models of Focal Epilepsy using High-Resolution EEG Recordings
Published on: June 6, 2015
15.5K
SEEG in 3D: Interictal Source Localization From Intracerebral Recordings
David Satzer1, Yasar T Esengul2, Peter C Warnke1
1Department of Neurosurgery, University of Chicago, Chicago, IL, United States.
Frontiers in Neurology
|February 25, 2022
Summary
Source localization accurately represents interictal discharges from stereo-electroencephalography (SEEG). The proportion of current within the surgical treatment volume predicted seizure-free outcomes, highlighting SEEG
Area of Science:
- Neuroscience
- Medical Imaging
- Epileptology
Background:
- Stereo-electroencephalography (SEEG) traditionally offers spatially limited analysis of epileptiform activity.
- Interpolating SEEG data may enable 3D representation and overcome interpretation limitations.
Purpose of the Study:
- To validate SEEG-based interictal source localization.
- To assess SEEG's ability to monitor activity in non-implanted brain regions.
Main Methods:
- Interictal epileptiform discharges were analyzed in 26 patients using SEEG.
- Source localization techniques (dipoles, sLORETA, SWARM) were applied using a finite element head model.
- Results were compared to the irritative zone (IZ) and surgical treatment volumes (TV).
Main Results:
- SWARM modeling of the IZ showed high sensitivity (83%) and specificity (94%) for predicting contacts.
- A higher proportion of current within the TV correlated with seizure-free outcomes (P=0.04).
- Scalp EEG addition and removal of near-field data from the TV impaired outcome prediction.
Conclusions:
- SEEG-based interictal source localization accurately depicts epileptogenic zones.
- Current distribution within the TV predicted seizure freedom when near-field recordings were utilized.
- Further methods are required for localizing far-field activity in non-implanted regions.
