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Journal of Biomedical Optics • Open Access

Optimal optode montage on electroencephalography/functional near-infrared spectroscopy caps dedicated to study epileptic discharges
Author(s): Alexis Machado; Odile Marcotte; Jean Marc Lina; Eliane Kobayashi; Christophe Grova

Paper Abstract

Functional near-infrared spectroscopy (fNIRS), acquired simultaneously with electroencephalography (EEG), allows the investigation of hemodynamic brain responses to epileptic activity. Because the presumed epileptogenic focus is patient-specific, an appropriate source/detector (SD) montage has to be reconfigured for each patient. The combination of EEG and fNIRS, however, entails several constraints on montages, and finding an optimal arrangement of optodes on the cap is an important issue. We present a method for computing an optimal SD montage on an EEG/fNIRS cap that focuses on one or several specific brain regions; the montage maximizes the spatial sensitivity. We formulate this optimization problem as a linear integer programming problem. The method was evaluated on two EEG/fNIRS caps. We simulated absorbers at different locations on a head model and generated realistic optical density maps on the scalp. We found that the maps of optimal SD montages had spatial resolution properties comparable to those of regular SD arrangements for the whole head with significantly fewer sensors than regular SD arrangements. In addition, we observed that optimal montages yielded improved spatial density of fNIRS measurements over the targeted regions together with an increase in signal-to-noise ratio.

Paper Details

Date Published: 14 February 2014
PDF: 17 pages
J. Biomed. Opt. 19(2) 026010 doi: 10.1117/1.JBO.19.2.026010
Published in: Journal of Biomedical Optics Volume 19, Issue 2
Show Author Affiliations
Alexis Machado, McGill Univ. (Canada)
Odile Marcotte, GERAD (Canada)
Univ. du Québec à Montréal (Canada)
Jean Marc Lina, École de Technologie Supérieure (Canada)
Eliane Kobayashi, McGill Univ. (Canada)
Christophe Grova, McGill Univ. (Canada)

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