Development of a Solid and Flexible Matching Medium for Microwave Medical Diagnostic Systems
| Autor: | Ivan Alic, Panagiotis Kosmas, Amin Moradpour, Olympia Karadima, Mykolas Ragulskis, Ferry Kienberger |
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| Rok vydání: | 2021 |
| Předmět: |
Permittivity
microwave system calibration lcsh:R5-920 Materials science Acoustics 020208 electrical & electronic engineering Clinical Biochemistry Antenna measurement 020206 networking & telecommunications matching medium 02 engineering and technology Dielectric dielectric properties measurement Article microwave imaging system microwave measurement antenna measurement Microwave imaging 0202 electrical engineering electronic engineering information engineering Calibration Antenna (radio) lcsh:Medicine (General) Monopole antenna Microwave |
| Zdroj: | Diagnostics; Volume 11; Issue 3; Pages: 550 Diagnostics, Vol 11, Iss 550, p 550 (2021) Diagnostics |
| DOI: | 10.5281/zenodo.6542109 |
| Popis: | This paper reports the development of a new composite material as a matching medium for medical microwave diagnostic systems, where maximizing the microwave energy that penetrates the interrogated tissue is critical for improving the quality of the diagnostic images. The proposed material has several advantages over what is commonly used in microwave diagnostic systems: it is semi-flexible and rigid, and it can maximize microwave energy coupling by matching the tissue’s dielectric constant without introducing high loss. The developed matching medium is a mirocomposite of barium titanate filler in polydimethylsiloxane (PDMS) in different weight-based mixing ratios. Dielectric properties of the material are measured using a Keysight open-ended coaxial slim probe from 0.5 to 10 GHz. To avoid systematic errors, a full dielectric properties calibration is performed before measurements of sample materials. Furthermore, the repeatability of the measurements and the homogeneity of the sample of interest are considered. Finally, to evaluate the proposed matching medium, its impact on a printed monopole antenna is studied. We demonstrate that the permittivity of the investigated mixtures can be increased in a controlled manner to reach values that have been previously shown to be optimal for medical microwave imaging (MWI) such as stroke and breast cancer diagnostic applications. As a result, the material is a good candidate for supporting antenna arrays designed for portable MWI scanners in applications such as stroke detection. |
| Databáze: | OpenAIRE |
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