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21 November 2023 Absorption and reduced scattering coefficients in epidermis and dermis from a Swedish cohort study
Hanna Jonasson, Ingemar Fredriksson, Sara Bergstrand, Carl Johan Östgren, Marcus Larsson, Tomas Strömberg
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Journal of Biomedical Optics, Vol. 28, Issue 11, 115001 (November 2023). https://doi.org/10.1117/1.JBO.28.11.115001
Abstract

Significance

Knowledge of optical properties is important to accurately model light propagation in tissue, but in vivo reference data are sparse.

Aim

The aim of our study was to present in vivo skin optical properties from a large Swedish cohort including 3809 subjects using a three-layered skin model and spatially resolved diffuse reflectance spectroscopy (Periflux PF6000 EPOS).

Approach

Diffuse reflectance spectra (475 to 850 nm) at 0.4 and 1.2 mm source–detector separations were analyzed using an inverse Monte Carlo method. The model had one epidermis layer with variable thicknesses and melanin-related absorptions and two dermis layers with varying hemoglobin concentrations and equal oxygen saturations. The reduced scattering coefficient was equal across all layers.

Results

Median absorption coefficients (mm − 1) in the upper dermis ranged from 0.094 at 475 nm to 0.0048 at 850 nm and similarly in the lower dermis from 0.059 to 0.0035. The reduced scattering coefficient (mm − 1) ranged from 3.22 to 1.20, and the sampling depth (mm) ranged from 0.23 to 0.38 (0.4 mm separation) and from 0.49 to 0.68 (1.2 mm separation). There were differences in optical properties across sex, age groups, and BMI categories.

Conclusions

Reference material for skin optical properties is presented.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Hanna Jonasson, Ingemar Fredriksson, Sara Bergstrand, Carl Johan Östgren, Marcus Larsson, and Tomas Strömberg "Absorption and reduced scattering coefficients in epidermis and dermis from a Swedish cohort study," Journal of Biomedical Optics 28(11), 115001 (21 November 2023). https://doi.org/10.1117/1.JBO.28.11.115001
Received: 10 July 2023; Accepted: 30 October 2023; Published: 21 November 2023
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KEYWORDS
Absorption
Scattering
Skin
Tissues
Optical properties
Blood
Data modeling
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