聚焦超声换能器电阻抗谱实时在线监测系统
Real-Time Online Monitoring System for Electric Impedance Spectra of Focused Ultrasound Transducers
肖建 1黄文军 2刘雅璐 3罗曼 3王杰 1宋丹1
作者信息
- 1. 重庆医科大学 生物医学工程学院、超声医学工程国家重点实验室,重庆 400016;重庆医科大学 重庆市生物医学工程学重点实验室,重庆 400016
- 2. 超声医疗国家工程研究中心,重庆 401121
- 3. 重庆医科大学 生物医学工程学院、超声医学工程国家重点实验室,重庆 400016;超声医疗国家工程研究中心,重庆 401121
- 折叠
摘要
高强度聚焦超声(HIFU)换能器作为聚焦超声消融手术(FUAS)系统的核心部件,其电阻抗谱是确定FUAS系统工作参数的重要参考依据,故对其进行实时在线监测具有重要意义.该文采用脉冲响应时域测量方法,将探测脉冲信号与HIFU换能器的工作时序相融合,并基于LabVIEW平台构建了一套HIFU换能器电阻抗谱实时在线监测系统,实现了对HIFU换能器电阻抗幅值与相位的高重复性及准确性的实时测量.通过对长时工作在大功率、高占空比条件下HIFU换能器电阻抗谱的实时在线监测,表明该监测系统可准确反应 HIFU换能器的特征频率漂移、阻抗幅值和相位的非线性变化.这为HIFU换能器电阻抗谱实时在线监测及驱动参数优化调节提供了技术方案,对HIFU换能器的设计优化和能量损耗机制研究具有重要的应用价值.
Abstract
High-intensity focused ultrasound(HIFU)transducers are a core component of focused ultrasound ablation surgery(FUAS)systems,whose electric impedance spectrum is an important index to determine working parameters that significantly affect FUAS systems performance.Real-time online monitoring of this spectrum is sig-nificantly beneficial.In this study,based on pulse response time-domain measurement,by merging the detected pulse signal serial into the FUAS operational electric driving signal sequence of the HIFU transducer,a real-time on-line monitoring system for the electric impedance spectrum of the HIFU transducer was constructed on the Lab-VIEW platform.Highly reproducible accurate measurements towards the magnitude and phase spectrum of the HI-FU transducer electric impedance were achieved.Subsequently,a monitoring system was applied to determine dy-namic changes in the electric impedance of the HIFU transducer under extreme working conditions.These include long-time service,high electrical driving power and duty cycle.The results demonstrate that the proposed system ac-curately monitors the HIFU transducer eigen frequencies drift,alongside nonlinear changes in impedance magnitude and phase.This paper presents a technical solution for real-time online monitoring of HIFU transducer impedance during FUAS,and provides feedback for drive parameter adjustment,which has practical application value for HI-FU transducer design optimization and energy loss mechanisms.
关键词
高强度聚焦超声(HIFU)换能器/电阻抗谱/脉冲响应/实时在线监测Key words
high-intensity focused ultrasound(HIFU)transducer/electric impedance spectrum/pulse re-sponse/real-time online monitoring引用本文复制引用
基金项目
国家自然科学基金青年基金(12204079)
重庆市自然科学基金面上项目(CSTB2023NSCQ-MSX0532)
出版年
2024
NETL
NSTL
万方数据