MEG Versus EEG HR for the Localization of the Epileptogenic Zone as Part of the Pre-surgical Assessment of Epilepsy

"MEG : Magnetoencephalography is the study of the magnetic fields produced by the electrical activity of the brain.~MEG signals are obtained while the patient is placed in a device specific to this technique. The latter comprises a recording chamber, recording sensors which are placed in a cryostat and an electronic measuring system. The magnetic fields are measured while the subject is placed in a shielded magnetic chamber protecting it from variations in the ambient magnetic field (displacement of metal masses, sector ...).~EEG HR: High Resolution EEG is defined as the recording of cerebral electrical activity with 128 electroencephalographic electrodes and with high temporal resolution usually followed by the use of source localization tools. The HR EEG is therefore derived from standard EEG techniques, but requires a higher number of electrodes and the use of source localization tools."