Optical transfer function and resolution of transillumination processes calculated by Monte Carlo simulations and diffusion theory

Horst Pulvermacher; Florian Spiegel

doi:10.1117/12.167449

1 February 1994 Optical transfer function and resolution of transillumination processes calculated by Monte Carlo simulations and diffusion theory

Horst Pulvermacher, Florian Spiegel

Author Affiliations +

Proceedings Volume 2082, Quantification and Localization Using Diffuse Photons in a Highly Scattering Medium; (1994) https://doi.org/10.1117/12.167449
Event: Europto Biomedical Optics '93, 1993, Budapest, Hungary

Abstract

The point spread function of transillumination processes is deduced from diffusion theory using common perturbation techniques. It is shown that an unusual term proportional to the gradient of the absorption or scattering coefficient of the object usually may be neglected. For large scattering and small absorption coefficients diffusion theory and Monte Carlo simulation lead to the same resolution. Monte Carlo calculations predict a value of the modulation transfer function for spatial frequency 0, that is large than 1. This effect is experimentally confirmed. The resolution has a minimum at a certain value of the scattering coefficient and increases slowly beyond it. The resolution is improved, the contrast for large objects impaired by an increase of the absorption coefficient.

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Horst Pulvermacher and Florian Spiegel "Optical transfer function and resolution of transillumination processes calculated by Monte Carlo simulations and diffusion theory", Proc. SPIE 2082, Quantification and Localization Using Diffuse Photons in a Highly Scattering Medium, (1 February 1994); https://doi.org/10.1117/12.167449

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