Thickness estimation of the subcutaneous fat using coaxial probe

[摘要] 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.

[学科分类] 肠胃与肝脏病学

[关键词] thickness measurement;permittivity measurement;biomedical measurement;finite difference time-domain analysis;statistical analysis;thickness estimation;subcutaneous fat layer;abdominal wall;coaxial probe;multilayer medium;aperture admittance;numerical simulation;FTDT analysis;statistical analysis;permittivity