一种多频相控超声治疗驱动系统

A Multifrequency Phase-Controlled Driving System for Ultrasound Therapy

提出了一种用于超声治疗的多频相控驱动系统。由于驱动系统的宽带特性,该系统能同时驱动谐振于不同工作频率的多元超声换能器或工作于同一谐振频率的多元超声换能器和相控阵超声换能器,并能对每一通道的功率、工作频率、相位分别控制。实验结果表明,系统具有优良的稳定性。选用合适的治疗超声换能器后,该系统既可为温热等辅助疗法提供驱动,也可作为高强度聚焦超声治疗的驱动系统。

Ultrasound therapy is a new type of therapy technology, there are hypertermia and high intensity focused ultrasound surgery(HIFUS).Compared with a single frequency system,mutiple frequency system has an additional function to combine power patterns of different frequencies. This function increases the availability of power patterns to treat tumors of various shapes and deepths. Therefore, we have in this article proposed a system with the ability to drive ultrasounic phased arrays of multiple resonant frequencies for ultrasound hyperthermia and HIFUS.The results show that this system is able to (1) drive multi-element applicators or phased arrays of a single resonant frequency through the multichannel power amplifiers. (2) concurrently drive transducer with different resonant frequencies. (3) adjust the relative phase and output power of each channel for the scanning ultrasounic focus,and (4)operate each channel with good output stability.