Design of sinusoidal excitation phased array ultrasound focusing system
10.19745/j.1003-8868.2025081
- VernacularTitle:基于正弦激励的相控阵超声聚焦控制系统设计
- Author:
Shi-yu WANG
1
;
Xu LIU
1
;
Fang-xuan CHU
1
;
Tao YIN
1
;
Zhi-peng LIU
1
;
Xiao-qing ZHOU
1
Author Information
1. 中国医学科学院北京协和医学院生物医学工程研究所,天津 300192;天津市神经调控与修复重点实验室,天津 300192
- Publication Type:Journal Article
- Keywords:
ultrasonic focusing control;
phased array technique;
sinusoidal excitation;
transcranial magneto-acoustic stimulation
- From:
Chinese Medical Equipment Journal
2025;46(5):14-20
- CountryChina
- Language:Chinese
-
Abstract:
Objective To design a phased array ultrasonic focusing control system based on sinusoidal signal excitation in order to avoid the introduction of high-frequency interference components into the ultrasonic transducer and improve the electronic focusing performance of phased array ultrasound.Methods The system designed mainly used the high-speed field programmable gate array(FPGA)chip combined with the high-speed digital to analog converter(DAC)to realize synchronous output and control of multi-channel sinusoidal signals.There were 8 sinusoidal excitation emission modules based on FPGA and DAC and one sinusoidal ultrasonic excitation control module based on ZYNQ MPSoC involved in the hardware part of the system,in which the emission modules generated multi-channel sinusoidal excitations and timing control of sinusoidal signals within the module and the control module was responsible for controlling the triggering timing between each sinusoidal excitation transmitter module.The system developed had its software designed with MATLAB App Designer to improve the human-computer interaction experience.Performance verification was carried out for the system by testing the output waveform,inter-channel delay error and focused sound field of each channel.Results The system developed achieved generation and timing control of 64-channel sinusoidal ultrasound excitations,with the output channel main frequency being 0.5 MHz,amplitude within 0 and±12.5 V and the inter-channel delay errors not higher than 26.0 ns;a focused sound field with a focal spot diameter of 4.2 mm(-3 dB)at a depth of 50 mm was obtained when the system was applied to driving a 64-array phased-array transducer.Conclusion The system designed is capable of realizing ultrasonic electron focusing under sinusoidal excitation,which helps to improve the focusing resolution of non-invasive and precise deep brain stimulation techniques relying on the accuracy of ultrasonic focusing such as transcranial magneto-acoustic stimulation(TMAS)and transcranial ultrasonic stimulation(TUS).[Chinese Medical Equipment Journal,2025,46(5):14-20]
