A Dynamic Impedance Matching System based on Phase Difference Detection for Ultrasonic Generator in Focused Ultrasound Surgery

2021 14th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI) Pub Date : 2021-10-23 DOI:10.1109/CISP-BMEI53629.2021.9624321

Zizhuang Chen, G. Shen, Wenjie Liu, Hao Wu, Huaxin Lu, Jian Tao, Zihao Liu

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引用次数: 1

Abstract

Focused ultrasound surgery (FUS) has been widely used as a non-invasive treatment for solid tumors and metastatic diseases. Ultrasonic generator is one of the critical parts in FUS therapy system. In order to realize real-time impedance matching of the ultrasonic generator and improve its energy transmission efficiency, a novel dynamic impedance matching system is designed and tested in this study. The proposed system can monitor the transducer impedance variation based on phase difference detection and dynamically adjust the matching circuit parameters through pulse width modulation (PWM) and synchronous switched capacitor. The results show that this system can compensate the impedance variation of ultrasonic transducer elements in real time, and the mean active power has been increased by 13.47% compared with static impedance matching, which demonstrate the feasibility and validity of the proposed system.

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聚焦超声手术中超声发生器相位差检测的动态阻抗匹配系统

聚焦超声手术作为一种无创治疗实体瘤和转移性疾病的方法已被广泛应用。超声发生器是FUS治疗系统的关键部件之一。为了实现超声发生器的实时阻抗匹配，提高其能量传输效率，本研究设计并测试了一种新型的动态阻抗匹配系统。该系统基于相位差检测监测换能器阻抗变化，并通过脉宽调制(PWM)和同步开关电容动态调整匹配电路参数。结果表明，该系统能够实时补偿超声换能器元件的阻抗变化，与静态阻抗匹配相比，平均有功功率提高13.47%，证明了该系统的可行性和有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2021 14th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)

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