Tan Feifei, Wang Haishi
College of Communication Engineering (College of Microelectronics), Chengdu University of Information Technology, Chengdu 610225, China.
Sensors (Basel). 2024 Sep 29;24(19):6311. doi: 10.3390/s24196311.
Microwave-induced thermoacoustic tomography (MITAT) holds significant promise in biomedical applications. It creates images using ultrasonic sensors to detect thermoacoustic signals induced by microwaves. The key to generating thermoacoustic signals that accurately reflect the fact is to achieve sufficient and uniform microwave power absorption of the testing target, which is closely tied to the microwave illumination provided by the antenna. In this article, we introduce a novel design and implementation of an ultra-wideband water immersion antenna for an MITAT system. We analyze and compare the advantages of selecting water as the background medium. Simulations are conducted to analyze the ultra-wideband characteristics in impedance matching, axial ratio, and radiation pattern of the proposed antenna. The measured |S| shows good agreement with the simulated results. We also simulate the microwave power absorption of tumor and brain tissue, and the uniform microwave power absorption and high contrast between the tumor and brain indicate the excellent performance of the proposed antenna in the MITAT system.
微波诱导热声断层扫描（MITAT）在生物医学应用中具有巨大潜力。它利用超声传感器检测微波诱导产生的热声信号来创建图像。产生能准确反映实际情况的热声信号的关键在于使测试目标实现足够且均匀的微波功率吸收，这与天线提供的微波照射密切相关。在本文中，我们介绍了一种用于MITAT系统的超宽带水浸天线的新颖设计与实现。我们分析并比较了选择水作为背景介质的优势。进行了仿真以分析所提天线在阻抗匹配、轴比和辐射方向图方面的超宽带特性。测量得到的|S|与仿真结果吻合良好。我们还对肿瘤和脑组织的微波功率吸收进行了仿真，肿瘤与脑之间均匀的微波功率吸收以及高对比度表明所提天线在MITAT系统中具有优异性能。
