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Journal of Biomedical Optics

Compliant head probe for positioning electroencephalography electrodes and near-infrared spectroscopy optodes
Author(s): Paolo Giacometti; Solomon G. Diamond
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Paper 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±0.23  mm , percent arc subdivision RMS accuracy of 0.19±0.15% , and mean normal force on the scalp of 2.28±0.88  N 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.

Paper Details

Date Published: 1 February 2013
PDF: 12 pages
J. Biomed. Opt. 18(2) 027005 doi: 10.1117/1.JBO.18.2.027005
Published in: Journal of Biomedical Optics Volume 18, Issue 2
Show Author Affiliations
Paolo Giacometti, Thayer School of Engineering at Dartmouth (United States)
Solomon G. Diamond, Thayer School of Engineering at Dartmouth (United States)

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