Real-Time Online Monitoring System for Electric Impedance Spectra of Focused Ultrasound Transducers
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.
NETL
NSTL
万方数据
