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Proceedings Paper

Skin hydration imaging using a long-wavelength near-infrared digital camera
Author(s): E. Michael Attas; Trevor B. Posthumus; Bernhard J. Schattka; Michael G. Sowa; Henry H. Mantsch; Shuliang L. Zhang
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Paper Abstract

Skin hydration is a key factor in skin health. Hydration measurements can provide diagnostic information on the condition of skin and can indicate the integrity of the skin barrier function. Near-infrared spectroscopy measures the water content of living tissue by its effect on tissue reflectance at a particular wavelength. Imaging has the important advantage of showing the degree of hydration as a function of location. Short-wavelength (650-1050 nm) near infrared spectroscopic reflectance imaging has previously been used in-vivo to determine the relative water content of skin under carefully controlled laboratory conditions. We have recently developed a novel spectroscopic imaging system to acquire image sets in the long-wavelength region of the near infrared (960 to 1700 nm), where the water absorption bands are more intense. The LW-NIR systems uses a liquid- crystal tunable filter in front of the objective lens and incorporates a 12-bit digital camera with a 320-by-240-pixel indium-gallium arsenide array sensor. Custom software controls the camera and tunable filter, allowing image sets to be acquired and displayed in near-real time. Forearm skin hydration was measured in a clinical context using the long- wavelength imaging system, a short-wavelength imaging system, and non-imaging instrumentation. Among these, the LW-NIR system appears to be the most sensitive at measuring dehydration of skin.

Paper Details

Date Published: 2 July 2001
PDF: 10 pages
Proc. SPIE 4259, Biomarkers and Biological Spectral Imaging, (2 July 2001); doi: 10.1117/12.432483
Show Author Affiliations
E. Michael Attas, National Research Council Canada (Canada)
Trevor B. Posthumus, National Research Council Canada (Canada)
Bernhard J. Schattka, National Research Council Canada (Canada)
Michael G. Sowa, National Research Council Canada (Germany)
Henry H. Mantsch, National Research Council Canada (Canada)
Shuliang L. Zhang, Unilever Research U.S. (United States)


Published in SPIE Proceedings Vol. 4259:
Biomarkers and Biological Spectral Imaging
Gregory H. Bearman; Darryl J. Bornhop; Richard M. Levenson; Darryl J. Bornhop, Editor(s)

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