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Proceedings Paper

Time-resolved transmittance: a comparison of the diffusion model approach with Monte Carlo simulations
Author(s): Ramona Rothfischer; Dirk Grosenick; Rainer Macdonald
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Paper Abstract

We discuss the determination of optical properties of thick scattering media from measurements of time-resolved transmittance by diffusion theory using Monte Carlo simulations as a gold standard to model photon migration. Our theoretical and experimental investigations reveal differences between calculated distributions of times of flight (DTOFs) of photons from both models which result in an overestimation of the absorption and the reduced scattering coefficient by diffusion theory which becomes larger for small scattering coefficients. By introducing a temporal shift in the DTOFs obtained with the diffusion model as additional fit parameter, the deviation in the absorption coefficient can be compensated almost completely. If the scattering medium is additionally covered by transparent layers (e.g. glass plates) the deviation between the DTOFs from both models is even larger which mainly effects the determination of the reduced scattering coefficient by diffusion theory. A temporal shift improves the accuracy of the optical properties derived by diffusion theory in this case as well.

Paper Details

Date Published: 16 July 2015
PDF: 6 pages
Proc. SPIE 9538, Diffuse Optical Imaging V, 95381H (16 July 2015); doi: 10.1117/12.2183762
Show Author Affiliations
Ramona Rothfischer, Physikalisch-Technische Bundesanstalt (Germany)
Dirk Grosenick, Physikalisch-Technische Bundesanstalt (Germany)
Rainer Macdonald, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 9538:
Diffuse Optical Imaging V
Hamid Dehghani; Paola Taroni, Editor(s)

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