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Spectroscopic method for determination of the absorption coefficient in brain tissue
Linköping University, Department of Biomedical Engineering, Biomedical Instrumentation. Linköping University, The Institute of Technology.
2010 (English)In: Journal of Biomedical Optics, ISSN 1083-3668, Vol. 15, no 5, 057005-1-057005-9 p.Article in journal (Refereed) Published
Abstract [en]

I use Monte Carlo simulations and phantom measurements to characterize a probe with adjacent optical fibres for diffuse reflectance spectroscopy during stereotactic surgery in the brain. Simulations and measurements have been fitted to a modified Beer–Lambert model for light transport in order to be able to quantify chromophore content based on clinically measured spectra in brain tissue. It was found that it is important to take the impact of the light absorption into account when calculating the apparent optical path length, lp, for the photons in order to get good estimates of the absorption coefficient, µa. The optical path length was found to be well fitted to the equation lp=a+b ln(Is)+c ln(µa)+d ln(Is)ln(µa), where Is is the reflected light intensity for scattering alone (i.e., zero absorption). Although coefficients ad calculated in this study are specific to the probe used here, the general form of the equation should be applicable to similar probes.

Place, publisher, year, edition, pages
Society of Photo-optical Instrumentation Engineers , 2010. Vol. 15, no 5, 057005-1-057005-9 p.
Keyword [en]
diffuse reflectance spectroscopy; brain; Monte Carlo simulations; chromophore quantification
National Category
Medical Laboratory and Measurements Technologies
URN: urn:nbn:se:liu:diva-60798DOI: 10.1117/1.3495719ISI: 000284837400049OAI: diva2:359198
Available from: 2010-10-27 Created: 2010-10-27 Last updated: 2010-12-20

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Johansson, Johannes
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Biomedical InstrumentationThe Institute of Technology
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ReferencesLink to record
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