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Proceedings Paper

Optical pathlength meter for near-infrared spectroscopy
Author(s): Iain D. C. Tullis; David T. Delpy
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Paper Abstract

Many commercial clinical Near Infrared Spectroscopy (NIRS) instruments rely upon estimates of the optical pathlength of tissue based upon the optode spacing multiplied by an average differential pathlength factor(DPF) for the tissue under investigation. Significant variation in the published DPF is the major source of error in the NIRS data quantification. To reduce this error, an inexpensive, stand-alone, single wavelength, single frequency optical pathlength meter based on the homodyne phase method was constructed for clinical use with an existing NIRO 300 instrument (Hamamatsu Photonics KK). The construction and testing of the optical pathlength meter is discussed.

Paper Details

Date Published: 31 October 2001
PDF: 7 pages
Proc. SPIE 4432, Diagnostic Optical Spectroscopy in Biomedicine, (31 October 2001); doi: 10.1117/12.447138
Show Author Affiliations
Iain D. C. Tullis, Univ. College London (United Kingdom)
David T. Delpy, Univ. College London (United Kingdom)


Published in SPIE Proceedings Vol. 4432:
Diagnostic Optical Spectroscopy in Biomedicine
Theodore G. Papazoglou; Georges A. Wagnieres, Editor(s)

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