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Proceedings Paper

Functional near infrared brain imaging with a brush-fiber optode to improve optical contact on subjects with dense hair
Author(s): Bilal Khan; Chester Wildey; Robert Francis; Fenghua Tian; Mario I. Romero; Mauricio R. Delgado; Nancy J. Clegg; Linsley Smith; Hanli Liu; Duncan L. MacFarlane; George Alexandrakis
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Paper Abstract

A major obstacle in functional near infrared spectroscopy (fNIRS) and imaging is poor optical contact of the optodes with the scalp due to obstruction by hair. To overcome this problem a novel brush-fiber extension was made as an attachment to existing commercial flat-face fiber bundle optodes. The goal was that the brush-fiber extension would thread through hair and improve optical contact on subjects with dense hair. Simulations and experiments were performed to assess the magnitude of these improvements. Firstly, a Monte Carlo (MC) simulation of photon propagation through the scalp with hair and hair follicles was performed showing a drop in light transmission for different hair densities in the range of 3 to 9 dB. Similar levels of signal loss at individual optodes were determined experimentally in preliminary measurements on a human subject, when comparisons were made for finger tapping activation measurements with and without the brush-fiber extensions. The effects of such losses on reconstructed images were also simulated by using neutral density filters during tissue phantom measurements. As brush-fibers attenuated the signal by approximately 2.5 dB due to imperfect optical contact with the flat-face optode tips we explored the idea of using larger diameter brush-fibers to overcome that loss.

Paper Details

Date Published: 18 February 2011
PDF: 11 pages
Proc. SPIE 7883, Photonic Therapeutics and Diagnostics VII, 78834V (18 February 2011); doi: 10.1117/12.873839
Show Author Affiliations
Bilal Khan, The Univ. of Texas at Arlington (United States)
Chester Wildey, The Univ. of Texas at Dallas (United States)
Robert Francis, The Univ. of Texas at Dallas (United States)
Fenghua Tian, The Univ. of Texas at Arlington (United States)
Mario I. Romero, The Univ. of Texas at Arlington (United States)
Mauricio R. Delgado, Scottish Rite Hospital for Children (United States)
Nancy J. Clegg, Scottish Rite Hospital for Children (United States)
Linsley Smith, Scottish Rite Hospital for Children (United States)
Hanli Liu, The Univ. of Texas at Arlington (United States)
Duncan L. MacFarlane, The Univ. of Texas at Dallas (United States)
George Alexandrakis, The Univ. of Texas at Arlington (United States)


Published in SPIE Proceedings Vol. 7883:
Photonic Therapeutics and Diagnostics VII
Kenton W. Gregory; Nikiforos Kollias; Andreas Mandelis; Henry Hirschberg; Hyun Wook Kang; Anita Mahadevan-Jansen; Brian Jet-Fei Wong; Justus F. R. Ilgner; Bodo E. Knudsen; E. Duco Jansen; Steen J. Madsen; Guillermo J. Tearney; Bernard Choi; Haishan Zeng; Laura Marcu, Editor(s)

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