Functional neuro-imaging as a pre-surgical tool in epilepsy

Area of Science:

• Neurology
• Radiology
• Medical Imaging

Background:

• Epilepsy surgery requires precise localization of the epileptogenic zone.
• Electroencephalography (EEG) and Magnetic Resonance Imaging (MRI) are standard but sometimes insufficient.
• Functional neuro-imaging offers complementary data for pre-surgical evaluation.

Purpose of the Study:

• To review current and emerging functional neuro-imaging techniques for epilepsy surgery.
• To discuss the role of these techniques in localizing the epileptogenic zone.
• To assess their position in the pre-surgical work-up of epilepsy.

Main Methods:

• Review of established neuro-imaging modalities: Positron Emission Tomography (PET) and ictal Single Photon Emission Computed Tomography (SPECT).
• Evaluation of advanced techniques: Magnetoencephalography/Magnetic Source Imaging (MEG/MSI), Diffusion Tensor Imaging (DTI), and functional Magnetic Resonance Imaging (fMRI).
• Discussion of novel and developing methods: fMRI-EEG, functional connectivity MRI, Near-Infrared Spectroscopy (NIRS), Magnetic Resonance Spectroscopy (MRS), and magneto nanoparticles.

Main Results:

• Traditional methods (PET, SPECT) show good sensitivity and specificity with expertise.
• Advanced techniques (MEG/MSI, DTI, fMRI) are increasingly used for localization and functional mapping.
• Emerging technologies show significant promise for future epilepsy surgery work-up.

Conclusions:

• Functional neuro-imaging is a valuable adjunct in pre-surgical epilepsy evaluation.
• Technological advancements continue to improve the precision of epileptogenic zone localization.
• These techniques are crucial when conventional methods are inconclusive or discordant.