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. © 2009 SPIE.

Accuracy of the nonlinear fitting procedure for time-resolved measurements on diffusive phantoms at NIR wavelengths / Spinelli L.; Martelli F.; Farina A.; Pifferi A.; Torricelli A.; Cubeddu R.; Zaccanti G.. - In: PROGRESS IN BIOMEDICAL OPTICS AND IMAGING. - ISSN 1605-7422. - ELETTRONICO. - 7174:(2009), pp. 717424-1-717424-10. ((Intervento presentato al convegno Optical Tomography and Spectroscopy of Tissue VIII tenutosi a San Jose, CA, usa nel 2009 [10.1117/12.808997].

Accuracy of the nonlinear fitting procedure for time-resolved measurements on diffusive phantoms at NIR wavelengths

Martelli F.
Supervision
;
Zaccanti G.
2009

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. © 2009 SPIE.
Progress in Biomedical Optics and Imaging - Proceedings of SPIE
Optical Tomography and Spectroscopy of Tissue VIII
San Jose, CA, usa
2009
Goal 3: Good health and well-being
Spinelli L.; Martelli F.; Farina A.; Pifferi A.; Torricelli A.; Cubeddu R.; Zaccanti G.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/1194697
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