Ictal EEG Source Imaging.

Area of Science:

• Neuroscience
• Medical Imaging
• Epileptology

Background:

• Traditional scalp EEG analysis for epilepsy surgery relies on visual inspection, often yielding imprecise seizure onset localization.
• This imprecision represents a significant limitation in current presurgical epilepsy evaluation and surgical planning.

Approach:

• This review examines various methods and strategies for performing ictal EEG source imaging (ESI).
• It addresses practical challenges in ictal ESI implementation, including noise reduction, artifact management, and signal enhancement techniques.
• Different approaches to component analysis are discussed to improve seizure-specific signal detection.

Key Points:

• ESI provides superior spatial resolution compared to standard ictal EEG review.
• Validation studies with varying electrode densities demonstrate the relative accuracy of ictal ESI across focal epilepsy types.
• Practical solutions for noise and artifact reduction are crucial for reliable ictal ESI.

Conclusions:

• Ictal ESI is an evolving and increasingly valuable tool for presurgical epilepsy evaluation.
• Its enhanced spatial resolution offers significant advantages over conventional methods for localizing seizure origins.
• The clinical utility of ictal ESI in guiding epilepsy surgery decisions is substantial and growing.