High-resolution EEG (HR-EEG) and magnetoencephalography (MEG)

Summary High-resolution EEG (HR-EEG) and magnetoencephalography (MEG) allow the recording of spontaneous or evoked electromagnetic brain activity with excellent temporal resolution. Data must be recorded with high temporal resolution (sampling rate) and high spatial resolution (number of channels)....

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Bibliographic Details
Published in:Neurophysiologie clinique 2015-03, Vol.45 (1), p.105-111
Main Authors: Gavaret, M, Maillard, L, Jung, J
Format: Article
Language:English
Subjects:
Automatic
Cerebral Cortex - physiopathology
Drug Resistant Epilepsy - diagnosis
Drug Resistant Epilepsy - physiopathology
EEG haute résolution
Electroencephalography - methods
Engineering Sciences
Epilepsy
Epilepsy - diagnosis
Epilepsy - physiopathology
HR-EEG
Humans
Localisation de source
Magnetoencephalography - methods
MEG
Neurology
Source localization
Épilepsie
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Summary:Summary High-resolution EEG (HR-EEG) and magnetoencephalography (MEG) allow the recording of spontaneous or evoked electromagnetic brain activity with excellent temporal resolution. Data must be recorded with high temporal resolution (sampling rate) and high spatial resolution (number of channels). Data analyses are based on several steps with selection of electromagnetic signals, elaboration of a head model and use of algorithms in order to solve the inverse problem. Due to considerable technical advances in spatial resolution, these tools now represent real methods of ElectroMagnetic Source Imaging. HR-EEG and MEG constitute non-invasive and complementary examinations, characterized by distinct sensitivities according to the location and orientation of intracerebral generators. In the presurgical assessment of drug-resistant partial epilepsies, HR-EEG and MEG can characterize and localize interictal activities and thus the irritative zone. HR-EEG and MEG often yield significant additional data that are complementary to other presurgical investigations and particularly relevant in MRI-negative cases. Currently, the determination of the epileptogenic zone and functional brain mapping remain rather less well-validated indications. In France, in 2014, HR-EEG is now part of standard clinical investigation of epilepsy, while MEG remains a research technique.
ISSN:0987-7053
1769-7131
DOI:10.1016/j.neucli.2014.11.011