【摘要】 低强度聚焦超声治疗技术是当前超声治疗领域的研究热点,应用场景不同对于超声系统的参数和性能要求也具有差异化,相控阵技术的引入为解决聚焦声场精确控制带来了新的思路。现有相控阵聚焦超声控制系统的输出参数相对固定,频率和功率可调范围窄,且支持换能器阵列通道的规模较小。该文设计了一种基于现场可编程逻辑门阵列(FPGA)的256通道的相控阵超声控制系统。实验结果表明,该系统实现频率1～3 MHz可调,输出电压峰-峰值±100 V连续可调,相位延时精度为5 ns,可驱动不同阵元数的相控阵探头,从而为超声治疗技术的研究提供多元化激励实施方案。更多还原

【Abstract】 The low intensity focused ultrasound treatment technology is a research hotspot in the field of ultrasound treatment. Different application scenarios have different requirements for parameters and performance of the ultrasound system, while the introduction of phased array technology brings new ideas to solve the problem of accurate control of the focused sound field. The output parameters of the existing phased array focused ultrasound control system are relatively fixed, the adjustable range of frequency and power is narrow, and the scale of supporting the transducer array channel is small. This paper presents a 256 channels phased array ultrasound control system based on FPGA. The experimental results show that the frequency of the system can be adjusted from 1 MHz to 3 MHz, the peak to peak value of the voltage is continuously adjustable within ±100 V, and the control precision of phase controlled delay is 5 ns. It can drive phased array probes with different array elements, so as to provide diversified incentive schemes for the research of ultrasonic therapy technology.更多还原