Comparison of Microwave Hyperthermia Applicator Designs with Fora Dipole and Connected Array

Gulsah Yildiz*, Iman Farhat*, Lourdes Farrugia, Julian Bonello, Kristian Zarb-Adami, Charles V. Sammut, Tuba Yilmaz, Ibrahim Akduman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In microwave hyperthermia tumor therapy, electromagnetic waves focus energy on the tumor to elevate the temperature above its normal levels with minimal injury to the surrounding healthy tissue. Microwave hyperthermia applicator design is important for the effectiveness of the therapy and the feasibility of real-time application. In this study, the potential of using fractal octagonal ring antenna elements as a dipole antenna array and as a connected array at 2.45 GHz for breast tumor hyperthermia application was investigated. Microwave hyperthermia treatment models consisting of different fractal octagonal ring antenna array designs and a breast phantom are simulated in COMSOL Multiphysics to obtain the field distributions. The antenna excitation phases and magnitudes are optimized using the global particle swarm algorithm to selectively increase the specific absorption rate at the target region while minimizing hot spots in other regions within the breast. Specific absorption rate distributions, obtained inside the phantom, are analyzed for each proposed microwave hyperthermia applicator design. The dipole fractal octagonal ring antenna arrays are comparatively assessed for three different designs: circular, linear, and Cross—array. The 16-antenna dipole array performance was superior for all three 1-layer applicator designs, and no distinct difference was found between 16-antenna circular, linear, or cross arrays. Two-layer dipole arrays have better performance in the deep-tissue targets than one-layer arrays. The performance of the connected array with a higher number of layers exceeds the performance of the dipole arrays in the superficial regions, while they are comparable for deep regions of the breast. The 1-layer 12-antenna circular FORA dipole array feasibility as a microwave hyperthermia applicator was experimentally shown.

Original languageEnglish
Article number6592
JournalSensors
Volume23
Issue number14
DOIs
Publication statusPublished - Jul 2023

Bibliographical note

Publisher Copyright:
© 2023 by the authors.

Funding

This work has received funding from COST Action grant agreement CA17115 and the Scientific and Technological Research Council of Turkey under grant agreement 118S074.

FundersFunder number
European Cooperation in Science and TechnologyCA17115
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu118S074

    Keywords

    • cancer therapeutics
    • connected array
    • dipole antenna
    • fractal octagonal ring array
    • microwave hyperthermia
    • particle swarm optimization

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