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A Versatile and Shelf-Stable Dielectric Coupling Medium for Microwave Imaging | IEEE Journals & Magazine | IEEE Xplore

A Versatile and Shelf-Stable Dielectric Coupling Medium for Microwave Imaging


Abstract:

Objective: To develop a new class of emulsions using a protein-based emulsifier as the coupling fluid for microwave imaging systems. Methods: In this paper, we provide a ...Show More

Abstract:

Objective: To develop a new class of emulsions using a protein-based emulsifier as the coupling fluid for microwave imaging systems. Methods: In this paper, we provide a theoretical basis for engineering shelf-stable dielectric fluids, a step-by-step formulation method, and measurements of complex dielectric properties in the frequency range of 0.5-3 GHz, which can be applicable for many of the recent microwave imaging systems. Results: This medium was primarily designed for long-term stability while providing a controllable range of complex dielectric permittivities given different fractions of its constituents. Consequently, this emulsion shows dielectric stability in open air throughout a 7-day experiment and temperature insensitivity over the range of 0{\,^\circ }C to 60{^\circ }. Conclusions: This control over dielectric permittivity enables formulations that tune the background-to-target contrast to the linearizable regime of iterative inverse scattering algorithms. Accordingly, the emulsion conductivity can also be controlled and reduced to maintain the required signal-to-noise ratio within the dynamic range of the imaging system. The new formulation overcomes the practical challenges of engineering coupling fluids for microwave imaging systems, e.g., temporal stability, non-toxic, low sensitivity to temperature variation, and easy formulation from readily available and inexpensive materials. Significance: The achieved properties associated with this new fluid are of particular benefit to microwave imaging systems used in thermal therapy monitoring.
Published in: IEEE Transactions on Biomedical Engineering ( Volume: 69, Issue: 8, August 2022)
Page(s): 2701 - 2712
Date of Publication: 23 February 2022

ISSN Information:

PubMed ID: 35196220

Funding Agency:


References

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