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Reducing Non-Through Body Energy Transfer in Microwave Imaging Systems.

Peter Serano1, Johnathan W Adams1, Louis Chen1

  • 1Worcester Polytechnic Institute, Worcester, MA USA 01609.

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|October 18, 2023
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Summary
This summary is machine-generated.

This study introduces metal-backed RF absorbing foam to improve microwave imaging (MI) systems. The foam significantly reduces signal loss around the body, enhancing the signal-to-noise ratio (SNR) for clearer imaging.

Keywords:
Antennas and propagationBiomedical imagingElectromagnetic propagation in absorbing mediaMicrowave imagingMicrowave measurementsNumerical simulationSurface waves

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Area of Science:

  • Biomedical Engineering
  • Electromagnetics
  • Medical Imaging

Background:

  • On-body antennas in microwave imaging (MI) systems can lead to signal degradation.
  • Energy directed around the body, rather than through it, lowers the signal-to-noise ratio (SNR).

Purpose of the Study:

  • To introduce and quantify the effectiveness of metal-backed RF absorbing foam.
  • To mitigate signal loss caused by around-body energy propagation in MI systems.
  • To improve the overall SNR of on-body antenna-based MI systems.

Main Methods:

  • Numerical simulations using Ansys HFSS to model the system.
  • Experimental validation using a helmet prototype with embedded antennas.
  • Quantification of RF absorbing foam's impact on antenna coupling and SNR.

Main Results:

  • Metal-backed RF absorbing foam significantly reduces around-body coupling.
  • A reduction of approximately 10dB in coupling was observed for Transmit (Tx) and Receive (Rx) antennas.
  • Simulations and experimental measurements showed consistent results.

Conclusions:

  • Metal-backed RF absorbing foam is an effective, low-cost solution for improving MI systems.
  • This method substantially enhances the SNR by reducing unwanted signal pathways.
  • The principle is applicable to various body parts for diverse MI applications.