Research Papers: Sensing

Method for rapid multidiameter single-fiber reflectance and fluorescence spectroscopy through a fiber bundle

[+] Author Affiliations
Christopher L. Hoy, Ute A. Gamm, Henricus J. C. M. Sterenborg, Dominic J. Robinson, Arjen Amelink

Erasmus Medical Center, Center for Optical Diagnostics and Therapy, Department of Radiation Oncology, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands

J. Biomed. Opt. 18(10), 107005 (Oct 14, 2013). doi:10.1117/1.JBO.18.10.107005
History: Received July 3, 2013; Revised August 21, 2013; Accepted August 23, 2013
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Abstract.  We have recently demonstrated a means for quantifying the absorption and scattering properties of biological tissue through multidiameter single-fiber reflectance (MDSFR) spectroscopy. These measurements can be used to correct single-fiber fluorescence (SFF) spectra for the influence of optical properties, enabling quantification of intrinsic fluorescence. In our previous work, we have used a series of pinholes to show that selective illumination and light collection using a coherent fiber bundle can simulate a single solid-core optical fiber with variable diameter for the purposes of MDSFR spectroscopy. Here, we describe the construction and validation of a clinical MDSFR/SFF spectroscopy system that avoids the limitations encountered with pinholes and free-space optics. During one measurement, the new system acquires reflectance spectra at the effective diameters of 200, 600, and 1000 μm, and a fluorescence spectrum at an effective diameter of 1000 μm. From these spectra, we measure the absolute absorption coefficient, μa, reduced scattering coefficient, μs, phase function parameter, γ, and intrinsic fluorescence, Qμa,xf, across the measured spectrum. We validate the system using Intralipid- and polystyrene sphere-based scattering phantoms, with and without the addition of the absorber Evans Blue. Finally, we demonstrate the combined MDSFR/SFF of phantoms with varying concentrations of Intralipid and fluorescein, wherein the scattering properties are measured by MDSFR and used to correct the SFF spectrum for accurate quantification of Qμa,xf.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Christopher L. Hoy ; Ute A. Gamm ; Henricus J. C. M. Sterenborg ; Dominic J. Robinson and Arjen Amelink
"Method for rapid multidiameter single-fiber reflectance and fluorescence spectroscopy through a fiber bundle", J. Biomed. Opt. 18(10), 107005 (Oct 14, 2013). ; http://dx.doi.org/10.1117/1.JBO.18.10.107005


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