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Journal of Biomedical Optics

Quantitative diffuse reflectance and fluorescence spectroscopy: tool to monitor tumor physiology in vivo
Author(s): Gregory M. Palmer; Ronald J. Viola; Thies Schroeder; Pavel S. Yarmolenko; Mark W. Dewhirst; Nirmala Ramanujam
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Paper Abstract

This study demonstrates the use of optical spectroscopy for monitoring tumor oxygenation and metabolism in response to hyperoxic gas breathing. Hemoglobin saturation and redox ratio were quantified for a set of 14 and 9 mice, respectively, measured at baseline and during carbogen breathing (95% O2, 5% CO2). In particular, significant increases in hemoglobin saturation and fluorescence redox ratio were observed upon carbogen breathing. These data were compared with data obtained concurrently using an established invasive technique, the OxyLite partial oxygen pressure (pO2) system, which also showed a significant increase in pO2. It was found that the direction of changes were generally the same between all of the methods, but that the OxyLite system was much more variable in general, suggesting that optical techniques may provide a better assessment of global tumor physiology. Optical spectroscopy measurements are demonstrated to provide a reliable, reproducible indication of changes in tumor physiology in response to physiologic manipulation.

Paper Details

Date Published: 1 March 2009
PDF: 8 pages
J. Biomed. Opt. 14(2) 024010 doi: 10.1117/1.3103586
Published in: Journal of Biomedical Optics Volume 14, Issue 2
Show Author Affiliations
Gregory M. Palmer, Duke Univ. (United States)
Ronald J. Viola, Duke Univ. (United States)
Thies Schroeder, Duke Univ. (United States)
Pavel S. Yarmolenko, Duke Univ. (United States)
Mark W. Dewhirst, Duke Univ. (United States)
Nirmala Ramanujam, Duke Univ. (United States)


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