EEG Source Imaging (ESI) utility in clinical practice.

Area of Science:

• Neurology
• Medical Imaging
• Computational Neuroscience

Background:

• Epilepsy surgery is crucial for medically refractory focal epilepsy.
• Accurate localization of the epileptogenic zone (EZ) is key to successful surgical outcomes.
• Current electrophysiological and neuroimaging methods have limitations in EZ localization.

Purpose of the Study:

• To review the utility of Electroencephalography (EEG) Source Imaging (ESI) in pre-surgical evaluation for epilepsy.
• To highlight ESI's effectiveness, especially in challenging cases like MRI-negative epilepsy.
• To promote wider adoption of ESI as a cost-effective and accurate clinical tool.

Main Methods:

• ESI is a model-based computational technique for 3D cortical source localization of brain electrical activity.
• Review of existing literature on ESI's clinical yield and applications in pre-surgical evaluation.
• Analysis of factors influencing ESI's accuracy, including head models, inverse solutions, and electrode density.

Main Results:

• ESI-based pre-surgical evaluation demonstrates a clinical yield of 73-91%.
• ESI provides valuable information in MRI-negative cases, extra-axial or basal temporal lobe epilepsy, and multifocal lesions.
• ESI is a cost-effective, non-invasive method with high localizing value.

Conclusions:

• ESI is a powerful tool for localizing the epileptogenic zone, particularly in MRI-negative epilepsy patients.
• Optimized ESI can significantly improve pre-surgical evaluation accuracy and cost-effectiveness.
• Increased utilization of ESI in surgical centers, especially in developing countries, is recommended.