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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 5 — May. 5, 2009

Real correlation time measurement in laser speckle contrast analysis using wide exposure time range images

Tomi Smausz, Dániel Zölei, and Béla Hopp  »View Author Affiliations


Applied Optics, Vol. 48, Issue 8, pp. 1425-1429 (2009)
http://dx.doi.org/10.1364/AO.48.001425


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Abstract

In laser speckle contrast analysis (LASCA) used for imaging of blood flow, besides the moving blood cells, the speckle pattern is also influenced by the imaging system and scattering properties of the laser- illuminated static surface. A latex microsphere ( 650 nm size) emulsion was covered with scattering semitransparent materials (Teflon foils, tracing paper). Speckle images were recorded with different exposure times ( 0.2 ms 500 ms ), and correlation times were determined by parameterizing the theoretical contrast-exposure time function. The correlation times obtained for covered and uncovered microsphere emulsions were in good agreement. The possibility of obtaining comparable, setup-independent results in blood perfusion monitoring can contribute to better applicability of LASCA.

© 2009 Optical Society of America

OCIS Codes
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(170.3880) Medical optics and biotechnology : Medical and biological imaging

ToC Category:
Imaging Systems

History
Original Manuscript: November 21, 2008
Revised Manuscript: February 11, 2009
Manuscript Accepted: February 12, 2009
Published: March 3, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Tomi Smausz, Dániel Zölei, and Béla Hopp, "Real correlation time measurement in laser speckle contrast analysis using wide exposure time range images," Appl. Opt. 48, 1425-1429 (2009)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-48-8-1425

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