Properties of Photon Density Waves in Multiple-Scattering Media

Authors

Bruce J. Tromberg, University of California - Irvine
Lars O. Svaasand, University of Trondheim
Tsong-Tseh Tsay, University of California - Irvine
Richard C. Haskell, Harvey Mudd CollegeFollow

Document Type

Article

Department

Physics (HMC)

Publication Date

2-1-1993

Abstract

Amplitude-modulated light launched into multiple-scattering media, e.g., tissue, results in the propagation of density waves of diffuse photons. Photon density wave characteristics in turn depend on modulation frequency (ω) and media optical properties. The damped spherical wave solutions to the homogeneous form of the diffusion equation suggest two distinct regimes of behavior: (1) a highfrequency dispersion regime where density wave phase velocity V_p has a ω dependence and (2) a low-frequency domain where V_p is frequency independent. Optical properties are determined for various tissue phantoms by fitting the recorded phase (Φ) and modulation (m) response to simple relations for the appropriate regime. Our results indicate that reliable estimates of tissuelike optical properties can be obtained, particularly when multiple modulation frequencies are employed.

Comments

First published in Applied Ethics, vol. 32, no. 4 (February 1993), by the Optical Society of America.

Rights Information

©1993 Optical Society of America

Terms of Use & License Information

Terms of Use for work posted in Scholarship@Claremont.

Recommended Citation

Tromberg, BJ, Svaasand, LO, Tsay, TT, Haskell, RC. Properties of photon density waves in multiple-scattering media. Appl Opt. 1993;32(4): 607-616.