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Journal of Biomedical Optics • Open Access

Dynamic light scattering by flowing Brownian particles measured with optical coherence tomography: impact of the optical system
Author(s): Ivan Popov; Alex Vitkin

Paper Abstract

The study of flowing Brownian particles finds numerous biomedical applications, ranging from blood flow analysis to diffusion research. A mathematical model for the correlation function of laser radiation scattered by flowing Brownian particles measured with fiber-based optical coherence tomography (OCT), which accounts for the effects of sample arm optics, is presented. It is shown that the parameters of an OCT optical system of any complexity can be taken into account by using the ABCD ray tracing matrix approach. Specifically, the impact of any optical system can be characterized by the changes in the effective beam radius, which replaces the Gaussian beam radius in the existing mathematical models of scattered radiation. It is shown that the validity of the developed ABCD matrix formalism is governed by the condition that the source coherence length is much smaller than the Rayleigh range in the sample. The predictions of the developed model are compared with previously published theories and with experimental data and agree well with the latter.

Paper Details

Date Published: 21 January 2016
PDF: 7 pages
J. Biomed. Opt. 21(1) 017002 doi: 10.1117/1.JBO.21.1.017002
Published in: Journal of Biomedical Optics Volume 21, Issue 1
Show Author Affiliations
Ivan Popov, Univ. of Toronto (Canada)
Alex Vitkin, Ontario Cancer Institute (Canada)
Univ. of Toronto (Canada)
Univ. Health Network (Canada)

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