Applications of reciprocity in diffusive optical tomography

Daniel J. Townsend; Douglas M. Dugas; David A. Boas; Charles A. DiMarzio

doi:10.1117/12.434534

29 June 2001 Applications of reciprocity in diffusive optical tomography

Daniel J. Townsend, Douglas M. Dugas, David A. Boas, Charles A. DiMarzio

Proceedings Volume 4250, Optical Tomography and Spectroscopy of Tissue IV; (2001) https://doi.org/10.1117/12.434534
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

The photon diffusion approximation provides an accurate description for the propagation of light in a highly scattering medium such as most tissue. However, complications arise at the boundaries between such a highly scattering medium and a clear medium, as at the locations where the light enters and exits the medium. Several approximations have been developed to address the input of light from a laser through an optical fiber, and several others have been developed to address the collection of light by an optical fiber and detector. The principle of reciprocity suggests that source and detector fibers could be treated identically, resulting in a simplification of the diffusive optical model. Such a formulation agrees quite well with Monte-Carlo and other models. In the present work, we apply the technique to some different situations, including the important practical problem of source and detector fibers which are not aligned to be normal to the surface. Simple analytical results based on this model will be compared to Monte-Carlo results.

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Daniel J. Townsend, Douglas M. Dugas, David A. Boas, and Charles A. DiMarzio "Applications of reciprocity in diffusive optical tomography", Proc. SPIE 4250, Optical Tomography and Spectroscopy of Tissue IV, (29 June 2001); https://doi.org/10.1117/12.434534

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KEYWORDS

Optical fibers

Monte Carlo methods

Receivers

Scattering

Optical tomography

Sensors

Diffusion

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