[BIC-announce] Special Seminar in Biomedical Engineering - Monday February 20th at 16h Room 321

[Christophe Grova]

Dear all,

In addition to our regular seminar, we will also have a special seminar thanks to the visit of Dr. D Tucker, from the compagny EGI Electrical Geodesics Inc. and University of Oregon, Eugene, USA

Monday - February 20th,  at 16h

Location: Room  321 Lyman Duff Building (Biomedical Engineering Dpt, 3775 University Street).

Speaker: Dr. D. Tucker PhD, compagny EGI Electrical Geodesics Inc. (http://www.egi.com/) and Professor in the Psychology Dpt of University of Oregon, Eugene, USA

Title: Dense array EEG source localization


Abstract:
Advances in electrical source localization are providing new insight into the
electrophysiology of the human cortex. Because the primary electric fields of the cortex are oriented perpendicular to the surface, accurate localization of the cortical sources of the EEG can be achieved by specification of the individualʼs cortex surface in structural MRI, tessellating the cortex into small (1 sq cm) dipole patches, computing the vector sum of surface normals in each patch, then developing an electric volume propagation (lead field) model showing how activity at each patch propagates to the head surface. The potentials at the head surface are then measured with dense array (256 channel) EEG, with sensor positions precisely registered with the MRI with geodesic photogrammetry. Because electric volume conduction is impeded by the resistive skull, an accurate skull model is essential, and this is now possible through calibrating CT measures of bone mineral density with electrical impedance tomography for each individual. When the forward lead field is thus specified carefully, inverse source estimation is found to be highly accurate. Initial applications of this method, such as mapping normal sensorimotor cortex, or mapping epileptic discharges, suggest that dense array EEG can provide characterizations of cerebral network activity with both spatial and temporal resolution.


A list of upcoming seminars can be found at : http://www.mcgill.ca/bme/news/seminars

See you there

Christophe Grova

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Christophe Grova, PhD
Assistant Professor
Biomedical Engineering Dpt
Neurology and Neurosurgery Dpt
Montreal Neurological Institute
Centre de Recherches en Mathématiques
Biomedical Engineering Department - Room 304
McGill University
3775 University Street, Montreal, Quebec, Canada, H3A 2B4
email : christophe.grova at mcgill.ca<mailto:christophe.grova at mcgill.ca>
tel : (514) 398 2516
fax : (514) 398 7461

web:
http://www.mni.mcgill.ca/research/gotman/members/christophe.html
http://www.bmed.mcgill.ca/
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