Quantitative diffuse reflectance and fluorescence spectroscopy: tool to monitor tumor physiology in vivo

Gregory M. Palmer; Ronald J. Viola; Thies Schroeder; Pavel S. Yarmolenko; Mark W. Dewhirst D.V.M.; Nirmala Ramanujam

doi:10.1117/1.3103586

1 March 2009 Quantitative diffuse reflectance and fluorescence spectroscopy: tool to monitor tumor physiology in vivo

Gregory M. Palmer, Ronald J. Viola, Thies Schroeder, Pavel S. Yarmolenko, Mark W. Dewhirst D.V.M., Nirmala Ramanujam

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Journal of Biomedical Optics, Vol. 14, Issue 2, 024010 (March 2009). https://doi.org/10.1117/1.3103586

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.

©(2009) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Gregory M. Palmer, Ronald J. Viola, Thies Schroeder, Pavel S. Yarmolenko, Mark W. Dewhirst D.V.M., and Nirmala Ramanujam "Quantitative diffuse reflectance and fluorescence spectroscopy: tool to monitor tumor physiology in vivo," Journal of Biomedical Optics 14(2), 024010 (1 March 2009). https://doi.org/10.1117/1.3103586

Published: 1 March 2009

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