Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Light transport in tissue

Not Accessible

Your library or personal account may give you access

Abstract

The propagation of light in tissue may be calculated by exact transport theory, or the approximate diffusion theory, provided the optical properties are known at the source wavelength. Optical properties for the exact methods are the absorption coefficient, scattering coefficient, and angular distribution of scattering. Appropriate properties for diffusion theory are the diffusion length and diffusion coefficient (corrected for anisotropic scattering). Computer programs and analytical solutions (for some simple geometries) exist, but the optical properties have to be determined experimentally and are not well defined as yet. The radiant energy fluence rate and the diffuse transmittance and reflectance have been measured in several tissues and in a few geometries, but there are gaps in the data as a function of wavelength. Calculations and measurements reveal that very large errors can result if the optical properties (for example, the diffusion length) are inaccurate, if anisotropic scattering is neglected, or if the finite size of the irradiating light beam is not taken into account. Furthermore, the radiant energy fluence and transmittance are perturbed by local regions of lesser or greater absorption, although recovery of the fluence and transmittance occurs beyond some three diffusion lengths.

© 1989 Optical Society of America

Full Article  |  PDF Article
More Like This
Light and temperature distribution in laser irradiated tissue: the influence of anisotropic scattering and refractive index

Massoud Motamedi, Sohi Rastegar, Gerald LeCarpentier, and Ashley J. Welch
Appl. Opt. 28(12) 2230-2237 (1989)

Calculating the response of isotropic light dosimetry probes as a function of the tissue refractive index

Willem M. Star and Johannes P. A. Marijnissen
Appl. Opt. 28(12) 2288-2291 (1989)

Extinction and absorption coefficients and scattering phase functions of human tissues in vitro

Renato Marchesini, A. Bertoni, S. Andreola, E. Melloni, and A. E. Sichirollo
Appl. Opt. 28(12) 2318-2324 (1989)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (10)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved