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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 9, Iss. 5 — Apr. 29, 2014

Correction of optical absorption and scattering variations in laser speckle rheology measurements

Zeinab Hajjarian and Seemantini K. Nadkarni  »View Author Affiliations

Optics Express, Vol. 22, Issue 6, pp. 6349-6361 (2014)

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Laser Speckle Rheology (LSR) is an optical technique to evaluate the viscoelastic properties by analyzing the temporal fluctuations of backscattered speckle patterns. Variations of optical absorption and reduced scattering coefficients further modulate speckle fluctuations, posing a critical challenge for quantitative evaluation of viscoelasticity. We compare and contrast two different approaches applicable for correcting and isolating the collective influence of absorption and scattering, to accurately measure mechanical properties. Our results indicate that the numerical approach of Monte-Carlo ray tracing (MCRT) reliably compensates for any arbitrary optical variations. When scattering dominates absorption, yet absorption is non-negligible, diffusing wave spectroscopy (DWS) formalisms perform similar to MCRT, superseding other analytical compensation approaches such as Telegrapher equation. The computational convenience of DWS greatly simplifies the extraction of viscoelastic properties from LSR measurements in a number of chemical, industrial, and biomedical applications.

© 2014 Optical Society of America

OCIS Codes
(110.6150) Imaging systems : Speckle imaging
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(290.1990) Scattering : Diffusion
(290.4210) Scattering : Multiple scattering
(300.1030) Spectroscopy : Absorption

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: December 26, 2013
Revised Manuscript: February 9, 2014
Manuscript Accepted: February 26, 2014
Published: March 11, 2014

Virtual Issues
Vol. 9, Iss. 5 Virtual Journal for Biomedical Optics

Zeinab Hajjarian and Seemantini K. Nadkarni, "Correction of optical absorption and scattering variations in laser speckle rheology measurements," Opt. Express 22, 6349-6361 (2014)

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