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Research Papers: Sensing

Evaluation of a novel noncontact spectrally and spatially resolved reflectance setup with continuously variable source-detector separation using silicone phantoms

[+] Author Affiliations
Stefan Andree, Carina Reble

Technische Universität Berlin, Institut für Optik und Atomare Physik, 10587 Berlin, Germany and Laser- und Medizin-Technologie, Berlin, Fabeckstraße 60-62, 14195 Berlin, Germany

Jürgen Helfmann, Ingo Gersonde, Gerd Illing

Laser- und Medizin-Technologie, Berlin, Fabeckstraße 60-62, 14195 Berlin, Germany

J. Biomed. Opt. 15(6), 067009 (December 09, 2009May 31, 2010November 01, 2010December 23, 2010December 23, 2010). doi:10.1117/1.3526367
History: Received December 09, 2009; Revised May 31, 2010; Accepted November 01, 2010; Published December 23, 2010; Online December 23, 2010
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We present a new variant of a noncontact, oblique incidence spatially resolved reflectance setup. The continuously variable source detector separation enables adaptation to high and low albedo samples. Absorption (μa) and reduced scattering coefficients (

μs) are determined in the wavelength range of 400–1000 nm using a lookup table, calculated by a Monte Carlo simulation of the light transport. The method is characterized by an silicone phantom study covering a wide parameter range 0.01 mm−1 ≤ μa ≤ 2.5 mm−1 and 0.2 mm−1μs ≤ 10 mm−1, which includes the optical parameters of tissue in the visible and near infrared. The influence of the incident angle and the detection aperture on the simulated remission was examined. Using perpendicular incidence and 90-deg detection aperture in the Monte Carlo simulation in contrast to the experimental situation with 30-deg incidence and 4.6-deg detection aperture is shown to be valid for the parameter range μs > 1 mm−1 and μa < 1.2 mm−1. A Mie calculation is presented, showing that a decreasing reduced scattering coefficient for increasing absorption can be the consequence of real physics instead of cross talk.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Stefan Andree ; Jürgen Helfmann ; Ingo Gersonde ; Carina Reble and Gerd Illing
"Evaluation of a novel noncontact spectrally and spatially resolved reflectance setup with continuously variable source-detector separation using silicone phantoms", J. Biomed. Opt. 15(6), 067009 (December 09, 2009May 31, 2010November 01, 2010December 23, 2010December 23, 2010). ; http://dx.doi.org/10.1117/1.3526367


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