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Journal of Biomedical Optics • Open Access

Development of a noncontact diffuse optical spectroscopy probe for measuring tissue optical properties

Paper Abstract

Optical reflectance probes are often used as tools to obtain optical spectra from superficial tissues and subsequently determine optical and physiological properties associated with early stage cancer. These probes, when placed directly on the tissue, are known to cause significant pressure-dependent changes in local optical properties. To address this, we fit the probe with an optical device that images the illumination and collection fibers onto the tissue surface, eliminating the influence of contact probe pressure on the sampling area. The noncontact probe addition addresses new optical conditions that may affect its performance such as tissue surface contour, and specular reflections by implementing an autofocusing mechanism and cross polarization. Extracted optical properties of tissue simulating phantoms yield errors of 3.46% in reduced scattering and 8.62% in absorbance. Autofocusing has extended the depth of field from 4 mm to throughout the 12 mm range of autofocus travel, while cross polarization has removed the incidence angle dependent specular reflection component from the collected signal.

Paper Details

Date Published: 1 December 2011
PDF: 4 pages
J. Biomed. Opt. 16(12) 120505 doi: 10.1117/1.3662459
Published in: Journal of Biomedical Optics Volume 16, Issue 12
Show Author Affiliations
Sheldon F. Bish, The Univ. of Texas at Austin (United States)
Narasimhan Rajaram, The Univ. of Texas at Austin (United States)
Brandon S. Nichols, The Univ. of Texas at Austin (United States)
James W. Tunnell, The Univ. of Texas at Austin (United States)

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