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Proceedings Paper

Optical transfer function and resolution of transillumination processes calculated by Monte Carlo simulations and diffusion theory
Author(s): Horst Pulvermacher; Florian Spiegel
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Paper 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.

Paper Details

Date Published: 1 February 1994
PDF: 12 pages
Proc. SPIE 2082, Quantification and Localization Using Diffuse Photons in a Highly Scattering Medium, (1 February 1994); doi: 10.1117/12.167449
Show Author Affiliations
Horst Pulvermacher, Institute fuer Medizinische Optik (Germany)
Florian Spiegel, Institute fuer Medizinische Optik (Germany)

Published in SPIE Proceedings Vol. 2082:
Quantification and Localization Using Diffuse Photons in a Highly Scattering Medium
Britton Chance; David T. Delpy; Marco Ferrari; Martin J. C. van Gemert; Gerhard J. Mueller; Valery V. Tuchin, Editor(s)

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