University of Oulu

Anton Sdobnov et al 2018 J. Phys. D: Appl. Phys. 51 155401. 10.1088/1361-6463/aab404

Speckle dynamics under ergodicity breaking

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Author: Anton, Sdobnov1; Alexander, Bykov1; Molodij, Guillaume2;
Organizations: 1Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu 90570, Finland
2Department of Veterinary Resources, Weizmann Institute of Science, Rehovot 76100, Israel
3Interdisciplinary Laboratory of Biophotonics, National Research Tomsk State University, Tomsk 634050, Russia
4Institute of Engineering Physics for Biomedicine (PhysBio), National Research Nuclear University MEPhI, 115409 Moscow, Russia
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe201902114462
Language: English
Published: IOP Publishing, 2018
Publish Date: 2019-03-26
Description:

Abstract

Laser speckle contrast imaging (LSCI) is a well-known and versatile approach for the non-invasive visualization of flows and microcirculation localized in turbid scattering media, including biological tissues. In most conventional implementations of LSCI the ergodic regime is typically assumed valid. However, most composite turbid scattering media, especially biological tissues, are non-ergodic, containing a mixture of dynamic and static centers of light scattering. In the current study, we examined the speckle contrast in different dynamic conditions with the aim of assessing limitations in the quantitative interpretation of speckle contrast images. Based on a simple phenomenological approach, we introduced a coefficient of speckle dynamics to quantitatively assess the ratio of the dynamic part of a scattering medium to the static one. The introduced coefficient allows one to distinguish real changes in motion from the mere appearance of static components in the field of view. As examples of systems with static/dynamic transitions, thawing and heating of Intralipid samples were studied by the LSCI approach.

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Series: Journal of physics. D, Applied physics
ISSN: 0022-3727
ISSN-E: 1361-6463
ISSN-L: 0022-3727
Volume: 51
Issue: 15
Article number: 155401
DOI: 10.1088/1361-6463/aab404
OADOI: https://oadoi.org/10.1088/1361-6463/aab404
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Subjects:
Funding: This work was supported by the CIMO Fellowships program (21.3.16/TM-16-10089/CIMO Fellowship/WS19), EDUFI Fellowship program (13.10.17/TM-17-10655/EDUFI Fellowship/ WS 19), the Academy of Finland (Grant No. 290596), the Tomsk State University Academic D I Mendeleev Fund Program and the National Research Nuclear University MEPhI’s Academic Excellence Project (Contract No. 02.a03.21.0005). The authors are grateful to A Dombovari, MSc, and Dr G Lorite for their help in the preparation of samples and their useful discussions.
Academy of Finland Grant Number: 290596
Detailed Information: 290596 (Academy of Finland Funding decision)
Copyright information: © 2018 IOP Publishing Ltd.