<abstract xmlns="http://www.w3.org/1999/xhtml"><p>We determine the in-vivo dielectric properties—resistivity and relative permittivity—of living epidermis and dermis of human skin soaked with a physiological saline solution for one minute between 1 kHz and 1 MHz. This is done by fitting approximate analytical solutions of a mechanistic model for the transport of charges in these layers to a training set comprising impedance measurements at two depth settings on stripped skin on the volar forearm of 24 young subjects. Here, the depth settings are obtained by varying the voltage at a second inject on the electrical-impedance-spectroscopy probe. The model and the dielectric properties are validated with a test set for a third depth setting with overall good agreement. In addition, the means and standard deviations of the thicknesses of living epidermis and dermis are estimated from a literature review as 61±7 μm and 1.0±0.2 mm respectively. Furthermore, extensions to resolve the skin layers in more detail are suggested.</p></abstract>

We determine the in-vivo dielectric properties—resistivity and relative permittivity—of living epidermis and dermis of human skin soaked with a physiological saline solution for one minute between 1 kHz and 1 MHz. This is done by fitting approximate analytical solutions of a mechanistic model for the transport of charges in these layers to a training set comprising impedance measurements at two depth settings on stripped skin on the volar forearm of 24 young subjects. Here, the depth settings are obtained by varying the voltage at a second inject on the electrical-impedance-spectroscopy probe. The model and the dielectric properties are validated with a test set for a third depth setting with overall good agreement. In addition, the means and standard deviations of the thicknesses of living epidermis and dermis are estimated from a literature review as 61±7 μm and 1.0±0.2 mm respectively. Furthermore, extensions to resolve the skin layers in more detail are suggested.

Dielectrical properties of living epidermis and dermis in the frequency range from 1 kHz to 1 MHz

Journal of Electrical Bioimpedance

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

We determine the in-vivo dielectric properties—resistivity and relative permittivity—of living epidermis and dermis of human skin soaked with a physiological...

Dielectrical properties of living epidermis and dermis in the frequency range from 1 kHz to 1 MHz

Published Online: Jul 02, 2019

Page range: 14 - 23

Received: Nov 28, 2018

DOI: https://doi.org/10.2478/joeb-2019-0003

Keywords
Dermis, epidermis, electrical impedance spectroscopy, in-vivo, relative permittivity, resistivity, skin thickness

© 2019 Tsai, Xue, Birgersson, Olmar, Birgersson, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Dielectrical properties of living epidermis and dermis in the frequency range from 1 kHz to 1 MHz

Published Online: Jul 02, 2019

Page range: 14 - 23

Received: Nov 28, 2018

DOI: https://doi.org/10.2478/joeb-2019-0003

KeywordsDermis, epidermis, electrical impedance spectroscopy, in-vivo, relative permittivity, resistivity, skin thickness

© 2019 Tsai, Xue, Birgersson, Olmar, Birgersson, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Dermis, epidermis, electrical impedance spectroscopy, in-vivo, relative permittivity, resistivity, skin thickness