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Research Papers: Sensing

Compliant head probe for positioning electroencephalography electrodes and near-infrared spectroscopy optodes

[+] Author Affiliations
Paolo Giacometti, Solomon G. Diamond

Thayer School of Engineering at Dartmouth, 14 Engineering Drive, Hanover, New Hampshire 03755

J. Biomed. Opt. 18(2), 027005 (Feb 01, 2013). doi:10.1117/1.JBO.18.2.027005
History: Received November 5, 2012; Revised January 4, 2013; Accepted January 7, 2013
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Abstract.  A noninvasive head probe that combines near-infrared spectroscopy (NIRS) and electroencephalography (EEG) for simultaneous measurement of neural dynamics and hemodynamics in the brain is presented. It is composed of a compliant expandable mechanism that accommodates a wide range of head size variation and an elastomeric web that maintains uniform sensor contact pressure on the scalp as the mechanism expands and contracts. The design is intended to help maximize optical and electrical coupling and to maintain stability during head movement. Positioning electrodes at the inion, nasion, central, and preauricular fiducial locations mechanically shapes the probe to place 64 NIRS optodes and 65 EEG electrodes following the 10–5 scalp coordinates. The placement accuracy, precision, and scalp pressure uniformity of the sensors are evaluated. A root-mean-squared (RMS) positional precision of 0.89±0.23mm, percent arc subdivision RMS accuracy of 0.19±0.15%, and mean normal force on the scalp of 2.28±0.88N at 5 mm displacement were found. Geometric measurements indicate that the probe will accommodate the full range of adult head sizes. The placement accuracy, precision, and uniformity of sensor contact pressure of the proposed head probe are important determinants of data quality in noninvasive brain monitoring with simultaneous NIRS-EEG.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Paolo Giacometti and Solomon G. Diamond
"Compliant head probe for positioning electroencephalography electrodes and near-infrared spectroscopy optodes", J. Biomed. Opt. 18(2), 027005 (Feb 01, 2013). ; http://dx.doi.org/10.1117/1.JBO.18.2.027005


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