Research Papers

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

[+] Author Affiliations
Gregory M. Palmer, Ronald J. Viola, Thies Schroeder

Duke University Medical Center, Department of Radiation Oncology, Box 3455, Durham, North Carolina 27710

Pavel S. Yarmolenko

Duke University, Department of Biomedical Engineering, Box 3455, Durham, North Carolina 27710

Mark W. Dewhirst

Duke University Medical Center, Department of Radiation Oncology, and Department of Biomedical Engineering, Box 3455, Durham, North Carolina 27710

Nirmala Ramanujam

Duke University, Department of Biomedical Engineering, Box 3455, Durham, North Carolina 27710

J. Biomed. Opt. 14(2), 024010 (April 22, 2009). doi:10.1117/1.3103586
History: Received July 28, 2008; Revised December 19, 2008; Accepted January 09, 2009; Published April 22, 2009
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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.

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© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Gregory M. Palmer ; Ronald J. Viola ; Thies Schroeder ; Pavel S. Yarmolenko ; Mark W. Dewhirst, et al.
"Quantitative diffuse reflectance and fluorescence spectroscopy: tool to monitor tumor physiology in vivo", J. Biomed. Opt. 14(2), 024010 (April 22, 2009). ; http://dx.doi.org/10.1117/1.3103586


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