Thickness estimation of the subcutaneous fat using coaxial probe

Area of Science:

• Biomedical Engineering
• Electromagnetics
• Medical Imaging

Background:

• Accurate subcutaneous fat layer thickness estimation is crucial for abdominal health assessments.
• Existing methods may be invasive or lack precision.
• The dielectric properties of fat significantly influence electromagnetic wave propagation.

Purpose of the Study:

• To develop and validate a non-invasive method for estimating abdominal subcutaneous fat layer thickness.
• To investigate the impact of fat layer properties on electromagnetic measurements.
• To address uncertainties in model parameters for improved fat layer estimation.

Main Methods:

• Utilizing a coaxial probe for non-invasive electromagnetic measurements.
• Modeling the abdominal wall as a multi-layer medium.
• Deriving an analytical model for probe aperture admittance.
• Validating the model with finite-difference-time-domain (FDTD) numerical simulations.

Main Results:

• Fat layer thickness and probe dimensions critically affect measurement sensitivity.
• Statistical analysis confirmed the significant impact of permittivity variations.
• The derived analytical model accurately predicts fat layer influence.

Conclusions:

• The coaxial probe method offers a promising non-invasive approach for subcutaneous fat estimation.
• Varying measurement locations can mitigate uncertainties in model parameters.
• This technique has potential applications in clinical diagnostics and body composition analysis.