[Resting functional MRI with default mode-based functional connectivity analysis for localization of epileptic...

Area of Science:

• Neuroimaging
• Epilepsy Research
• Brain Connectivity

Context:

• Epileptogenic zone localization is crucial for epilepsy surgery.
• Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) is a common but complex method.
• Understanding alterations in the brain's default mode network (DMN) in epilepsy is an active area of research.

Purpose:

• To develop and validate a novel fMRI-based technique for localizing epileptogenic foci.
• To leverage the neurophysiological principle that epileptic discharges alter the DMN.
• To achieve epileptogenic localization without the need for concurrent EEG.

Summary:

• A data-driven method combining independent component analysis and functional connectivity analysis was applied to resting-state fMRI data from 12 focal epilepsy patients.
• Components were ranked based on negative correlation with the posterior cingulate cortex signal.
• Results were compared with simultaneous EEG-fMRI findings, demonstrating high concordance between the data-driven method and pathological foci.

Impact:

• This default mode network-based functional connectivity analysis offers an effective, EEG-free method for epileptogenic focus localization.
• The technique also successfully maps the DMN in epileptic patients.
• This approach could simplify and improve the diagnostic process for epilepsy surgery planning.