Spectroscopic method for determination of the absorption coefficient in brain tissue

Johannes D. Johansson

doi:10.1117/1.3495719

1 September 2010 Spectroscopic method for determination of the absorption coefficient in brain tissue

Johannes D. Johansson

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Journal of Biomedical Optics, Vol. 15, Issue 5, 057005 (September 2010). https://doi.org/10.1117/1.3495719

Abstract

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, l_p, for the photons in order to get good estimates of the absorption coefficient, µ_a. The optical path length was found to be well fitted to the equation l_p=a+b ln(I_s)+c ln(µ_a)+d ln(I_s)ln(µa), where I_s is the reflected light intensity for scattering alone (i.e., zero absorption). Although coefficients a-d calculated in this study are specific to the probe used here, the general form of the equation should be applicable to similar probes.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Johannes D. Johansson "Spectroscopic method for determination of the absorption coefficient in brain tissue," Journal of Biomedical Optics 15(5), 057005 (1 September 2010). https://doi.org/10.1117/1.3495719

Published: 1 September 2010

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