12 February 2009 Accuracy of the nonlinear fitting procedure for time-resolved measurements on diffusive phantoms at NIR wavelengths
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Proceedings Volume 7174, Optical Tomography and Spectroscopy of Tissue VIII; 717424 (2009); doi: 10.1117/12.808997
Event: SPIE BiOS, 2009, San Jose, California, United States
Abstract
In this work we studied the accuracy of a non-linear fitting procedure, based on the Levenberg-Marquardt algorithm, for time-resolved measurements to retrieve the absorption and the reduced scattering coefficients of an absorbing diffusive medium. This procedure is suitable for retrieving optical properties in a wider range of situations (e.g. solid samples, reflectance geometry), with respect to the linear inversion procedures recently presented for both CW and time domain measurements. By means of both analytical and numerical (Monte Carlo) simulations, we quantified the influence of photon counts, temporal sampling, analytical model, background and instrument response function on the accuracy in the estimation of the optical properties. Also a new analytical model to describe light propagation in diffusive media based on the Radiative Transport Equation has been considered. The main source of error that affects the accuracy of the absorption and reduced scattering coefficients retrieved by the non-linear procedure appears to be the analytical model adopted in the inversion procedure.
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Lorenzo Spinelli, Fabrizio Martelli, Andrea Farina, Antonio Pifferi, Alessandro Torricelli, Rinaldo Cubeddu, Giovanni Zaccanti, "Accuracy of the nonlinear fitting procedure for time-resolved measurements on diffusive phantoms at NIR wavelengths", Proc. SPIE 7174, Optical Tomography and Spectroscopy of Tissue VIII, 717424 (12 February 2009); doi: 10.1117/12.808997; https://doi.org/10.1117/12.808997
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KEYWORDS
Scattering

Absorption

Monte Carlo methods

Optical properties

Data modeling

Picosecond phenomena

Signal to noise ratio

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