19 February 2009 Optical discrimination of surface reflection from volume backscattering in speckle contrast for skin roughness measurements
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Abstract
Background: The intermixing of light reflected from tissue surface and scattered from tissue volume complicates skin surface roughness assessment by laser speckle technique, a non-invasive optical method based on the analysis of the contrast of a speckle pattern. Objective: In this study we investigated optical discrimination methods to separate the two contributions in a speckle pattern. Methods: Three discrimination methods, spatial, polarization and spectral filtering, were implemented to suppress light from skin internal volume in a laser speckle device. In order to determine the effectiveness of the discrimination methods, speckle patterns were obtained from healthy volunteers, and polychromatic speckle contrast was computed before and after each filtering procedure. Results: Speckle contrast increased after discrimination filtering. A simple formula was derived to calculate the speckle contrast associated with light scattered from the skin surface. This corrected speckle contrast was proposed to be used for skin roughness assessment.
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Lioudmila Tchvialeva, Haishan Zeng, Igor Markhvida, Gurbir Dhadwal, Lianne McLean, David I. McLean, Harvey Lui, Tim K. Lee, "Optical discrimination of surface reflection from volume backscattering in speckle contrast for skin roughness measurements", Proc. SPIE 7161, Photonic Therapeutics and Diagnostics V, 71610I (19 February 2009); doi: 10.1117/12.811916; https://doi.org/10.1117/12.811916
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