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Dmitry Yudovsky1, Anthony J Durkin

  • 1University of California, Irvine, Beckman Laser Institute, Laser Microbeam and Medical Program, 1002 Health Sciences Road, Irvine, California 92612, USA. yudovsky@uci.edu

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Summary

This study presents a novel biomedical optics technique to accurately measure blood oxygenation in skin by separating melanin absorption from blood absorption. This method improves tissue health assessment across diverse skin types.

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Area of Science:

  • Biomedical optics
  • Tissue optics
  • Medical imaging

Background:

  • Biomedical optics techniques monitor tissue blood volume and oxygen saturation for assessing tissue health.
  • Estimating blood absorption in skin is challenging due to confounding melanin absorption in the epidermis.
  • Epidermal thickness and pigmentation vary significantly across individuals and conditions.

Purpose of the Study:

  • To develop and validate a technique for decoupling melanin absorption from blood absorption in skin.
  • To enable accurate assessment of dermal blood oxygenation across a wide range of skin types and thicknesses.
  • To compare the performance of iterative fitting and direct neural network inversion for optical property determination.

Main Methods:

  • Utilized artificial neural networks (ANNs) to map optical properties to spatial frequency domain diffuse reflectance.
  • Employed iterative fitting to determine optical properties from simulated reflectance data.
  • Trained an ANN for direct mapping of reflectance to optical properties, bypassing iterative fitting.
  • Independently determined epidermal optical thickness and dermal absorption/scattering coefficients.

Main Results:

  • The developed technique successfully decouples melanin and blood absorption effects.
  • Both iterative fitting and direct ANN inversion accurately determined epidermal and dermal optical properties.
  • The study provides a method for reliable optical property estimation in diverse skin types.
  • Comparison of accuracy and efficiency between the two inversion methods was performed.

Conclusions:

  • A robust method is established for accurate optical property determination in multi-layered skin.
  • The technique overcomes limitations posed by epidermal melanin absorption.
  • This advancement holds potential for improved non-invasive tissue health and oxygenation monitoring.
  • The study validates the use of ANNs in solving complex optical inverse problems.