Speckle dynamics under ergodicity breaking

Anton Sdobnov, Alexander Bykov, Guillaume Molodij, Vyacheslav Kalchenko, Topias Jarvinen, Alexey Popov, Krisztian Kordas, Igor Meglinski

Research output: Contribution to journalArticle

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.

Original languageEnglish
Article number155401
JournalJournal of Physics D: Applied Physics
Volume51
Issue number15
DOIs
Publication statusPublished - 26 Mar 2018

Keywords

  • ergodicity
  • motion estimation
  • optical imaging
  • speckle contrast
  • speckle pattern

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    Sdobnov, A., Bykov, A., Molodij, G., Kalchenko, V., Jarvinen, T., Popov, A., Kordas, K., & Meglinski, I. (2018). Speckle dynamics under ergodicity breaking. Journal of Physics D: Applied Physics, 51(15), [155401]. https://doi.org/10.1088/1361-6463/aab404