Open AccessThickness estimation of the subcutaneous fat using coaxial probe
Author(s) -
Ramezani Mohammad Hossein,
Nadimi Esmaeil S.
Publication year - 2016
Publication title -
healthcare technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 19
ISSN - 2053-3713
DOI - 10.1049/htl.2015.0036
Subject(s) - finite difference time domain method , permittivity , admittance , coaxial , materials science , attenuation , sensitivity (control systems) , relative permittivity , finite difference method , acoustics , layer (electronics) , aperture (computer memory) , biomedical engineering , optics , electrical impedance , mechanics , mathematics , mathematical analysis , composite material , physics , computer science , dielectric , electronic engineering , optoelectronics , engineering , telecommunications , quantum mechanics
In this Letter, a non‐invasive method for thickness estimation of the subcutaneous fat layer of abdominal wall is presented by using a coaxial probe. Fat layer has the highest impact on the averaged attenuation parameter of the abdominal wall due to its high thickness and low permittivity. The abdominal wall is modelled as a multi‐layer medium and an analytical model for the probe is derived by calculation of its aperture admittance facing to this multi‐layer medium. The performance of this model is then validated by a numerical simulation using finite‐difference‐time‐domain (FDTD) analysis. Simulation results show the high impact of the probe dimension and fat layer thickness on the sensitivity of the measured permittivity. The authors further investigate this sensitivity by statistical analysis of the permittivity variations. Finally, measuring in different locations relative to the body surface is presented as a solution to estimate the fat layer thickness in the presence of uncertainty of model parameters.