基于LabVIEW的感应式磁声成像系统的设计

摘要

利用虚拟仪器技术和PXI总线技术设计了一套高速同步的感应式磁声成像数据采集和分析系统。整个平台以LabVIEW为开发软件，架构了由永磁体、脉冲信号发生器、超声传感器、运动控制器、高速数字化仪等组成的硬件系统，实现了磁声信号的实时监测和数据分析与处理的功能。该平台具有模块化强、操作方便并且重建算法易于嵌入的优点。为了验证平台设计的有效性，以同心双环为样本在实际的平台上进行了测试和应用，结果表明，最后重构的图像能清晰准确地显示出样本的外形和尺寸。该平台的实现将进一步推进感应式磁声成像技术的实验研究，为不同模体的试验带来很大便利，大大提高了实验和研究工作的效率。%In this article, a high⁃speed synchronous magnetoacoustic tomography system was developed based on the vitual machine and the PXI bus. Using the LabVIEW software, the entire platform can automatically control the hardware system which is composed of the magnets, pulsed signal generator, ultrasonic sensor, motion controller, data acquisition card and personal computer. The platform realized the functions of magnetoacoustic signal analysis and real⁃time monitoring and data processing which has the following advantages:program modularity, easy to oper⁃ate and embedding the reconstruction algorithms. In order to verify the validity of platform design, a sample of a concentric double loop in the actual platform was applied, the results showed that the final reconstructed image can clearly and accurately show the shape and size of the sample. The platform will further promote the experiment study of magnetoacoustic tomography with magnetic induction, and it will bring great convenience for different phantom tests, which greatly improves the efficiency of the research.