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Electromagnetic Source Imaging in Presurgical Evaluation of Children with Drug-Resistant Epilepsy

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Sparse MEG source imaging in Landau-Kleffner syndrome.

Min Zhu¹, Wenbo Zhang, Deanna Dickens

¹School of Electrical and Computer Engineering, University of Oklahoma, Norman, OK 73019, USA. Min.Zhu-1@ou.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 19, 2012

Summary

Variation based sparse cortical current density (VB-SCCD) imaging successfully identified epileptic sources in a Landau-Kleffner syndrome patient. This technique aids in understanding epileptic networks and presurgical planning for epilepsy.

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Area of Science:

Neuroscience
Medical Imaging
Epileptology

Background:

Landau-Kleffner syndrome (LKS) presents diagnostic challenges due to normal brain structure on MRI.
Identifying the epileptogenic zone is crucial for presurgical planning in LKS patients.

Purpose of the Study:

To apply variation based sparse cortical current density (VB-SCCD) imaging to reconstruct cortical sources of interictal spikes in an LKS patient.
To assess the utility of VB-SCCD in localizing epileptic origins and aiding presurgical diagnosis.

Main Methods:

Structural MRI was used to create realistic head and cortex models.
148-channel magnetoencephalography (MEG) data were recorded between seizures.
VB-SCCD imaging was employed to analyze 29 epileptiform spikes.

Main Results:

Primary cortical sources were localized to the left intra- and perisylvian cortex.
Secondary extrasylvian sources were also identified.
Spatio-temporal patterns revealed neuronal synchrony and propagation of epileptic discharges.

Conclusions:

VB-SCCD imaging shows promise for assisting presurgical planning in LKS.
The technique can help determine the lateralization of epileptic origins and study LKS neural networks.
Future applications may include non-invasive localization of eloquent cortex for language in epilepsy patients.