二维相控阵阵元参数对波束聚焦效果的影响研究  

Research on effect of element parameter in two-dimensional phased arrays on beam focusing performance

作　　者：陈天宇 陈科[1] CHEN Tianyu;CHEN Ke(School of Biomedical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学生物医学工程学院,成都610065

出　　处：《计算机应用文摘》2024年第20期173-176,共4页

摘　　要：二维相控阵探头存在制备成本高昂、制作流程复杂等问题,在制备前需要优先确定探头参数尺寸以避免造成不必要的损失。基于超声仿真实验平台,文章通过紧密型阵元排列和256通道配置,从中心频率、阵元中心间距(pitch)和纵向孔径等方面分析了探头参数对波束的分辨率、穿透深度和旁瓣特性的影响。实验结果表明,高频换能器具有较高的分辨率但穿透深度较浅,低频换能器的穿透深度较深但分辨率低;较小的中心间距有助于减少旁瓣但制造难度较大;较大的纵向孔径可提升聚焦效果,但在超过一定值后效果趋于稳定。通过优化这些参数,可以在不同应用场景下实现最佳的超声成像效果,为超声换能器设计提供了重要的理论支持和实践参考。The two-dimensional phased array probe has problems such as high preparation cost and complex manufacturing process.Before preparation,it is necessary to first determine the probe parameter size to avoid unnecessary losses.Based on the ultrasound simulation experimental platform,this article analyzes the influence of probe parameters on the resolution,penetration depth,and sidelobe characteristics of the beam from the aspects of center frequency,pitch,and longitudinal aperture through a compact array element arrangement and 256 channel configuration.The experimental results show that high-frequency transducers have high resolution but shallow penetration depth,while low-frequency transducers have deep penetration depth but low resolution.A smaller center to center distance helps reduce sidelobes but is more difficult to manufacture.A larger longitudinal aperture can improve the focusing effect,but the effect tends to stabilize after exceeding a certain value.By optimizing these parameters,the best ultrasound imaging results can be achieved in different application scenarios,providing important theoretical support and practical reference for the design of ultrasound transducers.

关 键 词：二维相控阵 聚焦波束 阵元参数 

分 类 号：TB559[理学—物理]