超声弹性成像声辐射力激励模块设计

Design of Acoustic Radiation Force Module for Ultrasound Elastography

研制了一种基于FPGA的64通道超声弹性成像专用的声辐射力激励模块。该电路采用双极性驱动,且激励频率、脉冲重复频率、脉冲个数、阵元个数和聚焦深度可调。利用OptiSon激光声场系统对特定参数下声场进行测试,结果显示聚焦达3 mm。利用RF2000声辐射力天平对声功率进行测量,得出声功率与脉冲个数和阵元个数呈线性正相关,与激励电压峰峰值的平方成正比例关系。该模块还具有外部同步触发功能,能与现有B型超声系统结合,从而方便的增加弹性成像新功能,具有广阔的应用前景。

Developing an acoustic radiation force excitation module including 64 channels based in FPGA for ultrasound elastography. The circuit of the module was drived in bipolar, and the parameters such as excitation frequency, pulse repetition frequency, pulse number, element number and focus depth were ajustable. The acoustic field for special parameter was experimented with OptiSon laser acoustic field system with a result which reflects the width of focal spot is about 3 ram. The acoustic power was experimented with RFB2000 radiation force balance with a result which reflects acoustic power is increasing linearly with the.number of pulses and the number of elements, and is increasing squarely with the peak-to-peak value of excitation voltage. The module is promising in factual application which can be triggered externally in synchronously, and can be combined with B-mode ultrasound system for ultrasound elastograpy.