Annals of Indian Academy of Neurology
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ARTICLE
Year : 2014  |  Volume : 17  |  Issue : 5  |  Page : 107-112

Magnetoencephalography: Basic principles


Department of Neurology, Creighton University School of Medicine, ACH-Creighton University Medical Center, Omaha, Nebraska, USA

Correspondence Address:
Sanjay P Singh
Department of Neurology, 601 North 30th Street, Suite 5300, Omaha, NE-68131
USA
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-2327.128676

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Magnetoencephalography (MEG) is the measurement of the magnetic field generated by the electrical activity of neurons. It is usually combined with a magnetic resonance imaging to get what is called magnetic source imaging. The technology that has helped record these minute magnetic fields is super-conducting quantum interference detector which is like a highly sensitive magnetic field meter. To attenuate the external magnetic noise the MEG is housed inside a magnetically shielded room. The actual sensors recording magnetic fields are magnetometers and/or gradiometers. MEG fields pass through the head without any distortion. This is a significant advantage of MEG over electroencephalography. MEG provides a high spatial and temporal resolution. The recording and identification information should be according to the American Clinical Magnetoencephalography Society guidelines published in 2011. MEG currently has two approved indications in the United States, one is for pre-operative brain mapping and the other is for use in epilepsy surgery. MEG studies have shown functional brain tissue inside brain tumors.


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