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Proceedings Article

Functional near infrared brain imaging with a brush-fiber optode to improve optical contact on subjects with dense hair

[+] Author Affiliations
Bilal Khan, Fenghua Tian, Mario I. Romero, Hanli Liu, George Alexandrakis

The Univ. of Texas at Arlington (USA)

Chester Wildey, Robert Francis, Duncan L. MacFarlane

The Univ. of Texas at Dallas (USA)

Mauricio R. Delgado, Nancy J. Clegg, Linsley Smith

Scottish Rite Hospital for Children (USA)

Proc. SPIE 7883, Photonic Therapeutics and Diagnostics VII, 78834V (February 17, 2011); doi:10.1117/12.873839
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From Conference Volume 7883

  • Photonic Therapeutics and Diagnostics VII
  • San Francisco, California, USA | January 22, 2011

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.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Bilal Khan ; Chester Wildey ; Robert Francis ; Fenghua Tian ; Mario I. Romero, et al.
"Functional near infrared brain imaging with a brush-fiber optode to improve optical contact on subjects with dense hair", Proc. SPIE 7883, Photonic Therapeutics and Diagnostics VII, 78834V (February 17, 2011); doi:10.1117/12.873839; http://dx.doi.org/10.1117/12.873839


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