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用于3D超声波成像的大型分离元素散射阵列 (LDESA) 的模拟,设计和表征.

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    IEEE transactions on ultrasonics, ferroelectrics, and frequency control
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    大偏差元件 (LDE) 稀疏阵列改善了超声成像的信号噪声比 (SNR). 这项研究证明了B模式成像的LDE稀疏阵列可行性,增强了SNR而不损害对比度.

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    科学领域:

    • 超声波成像 超声波成像
    • 医疗传感器技术 医疗传感器技术
    • 阵列信号处理系统的信号处理.

    背景情况:

    • 稀疏阵列为大型二维阵列提供制造优势,但通常具有较低的信号噪声比 (SNR).
    • 大分歧元件 (LDE) 技术通过结合大发射面积和角孔径来增强SNR.

    研究的目的:

    • 用LDE稀疏数组 (LDESA) 证明B模式成像的可行性.
    • 为了增加稀疏阵列SNR而不会显著影响图像对比度.

    主要方法:

    • 使用基于角冲动响应的超声仿真 (AIRUS) 进行模拟,用于合的图像传感器优化.
    • 优化探头参数 (直径,布局,LDE大小,电声响应) 以最大限度地提高对比率 (CR).
    • 使用费马螺旋布局的1MHz LDESA的实验性表征.

    主要成果:

    • 一个直径100毫米的费马螺旋LDESA和256个LDE (3.5毫米直径) 被设计和测试.
    • 在 -6 dB 时,LDE 实现了 75° 的角孔径.
    • 该阵列展示了一个可转向的1度宽焦束,幅度损失最小,并实现了2.2毫米横向和1.8毫米轴向分辨率.

    结论:

    • LDESA技术成功地提高了B模式超声波成像的SNR.
    • 开发的LDESA设计实现了高分辨率和光束方向性,证明了其临床潜力.