2 February 2012 Eliminating the effect of bulk scattering when measuring skin surface roughness using speckle contrast: a skin phantom study
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Abstract
We have been investigating the quantification of skin surface roughness by polychromatic speckle contrast. Speckle contrast, being a measure of light coherence, decreases as coherence decays when low coherent light is reflected from a rough surface. The main constraint of applying the technique to skin is the presence of bulk scattering along with surface reflection. Bulk scattering also decays coherence and is a source of noise. To examine the effect of bulk contribution, we studied speckle patterns generated by silicone phantoms with controllable roughness and optical parameters in the range of human skin. We discovered that using the theoretical curve plotting speckle contrast vs. surface roughness as a calibration curve overestimates the phantom surface roughness. We propose to use the effective calibration curve for the proper skin roughness measurements. The effective calibration curve was obtained experimentally taking the advantage of its weak dependence on phantom's attenuation coefficients.
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Lioudmila Tchvialeva, Lioudmila Tchvialeva, Igor Markhvida, Igor Markhvida, David I. McLean, David I. McLean, Harvey Lui, Harvey Lui, Haishan Zeng, Haishan Zeng, Tim K. Lee, Tim K. Lee, "Eliminating the effect of bulk scattering when measuring skin surface roughness using speckle contrast: a skin phantom study", Proc. SPIE 8230, Biomedical Applications of Light Scattering VI, 823004 (2 February 2012); doi: 10.1117/12.912255; https://doi.org/10.1117/12.912255
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