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A DSP-based real-time optical Doppler tomography system beamforming study of a 10 x 128 1.75D ultrasound array.

机译：基于DSP的10 x 128 1.75D超声阵列的实时光学多普勒层析成像系统波束成形研究。

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摘要

Topic 1: Beamforming study of a 10x128-element, 1.75D ultrasound array. 1.75D arrays allow beam steering in elevation, which is valuable for three-dimensional (3D) imaging within a certain field of view. 3D imaging has important advantage in detecting and visualizing small lesions from multiple viewing angles. Tetrad Co. has manufactured a 1.75D array using the state-of-the-art technology. This array consists of 10 rows in elevation and 128 elements in azimuth, 1280 elements in total. We have constructed 1280-channel transmission (TX) circuitry, 1280-to-40 multiplexing (MUX) circuitry and 40-channel parallel receiving (RX) circuitry. In addition to the conventional ultrasound beamforming in azimuth direction, the elevation scanning and focusing can be performed and image quality can be improved. With the array and the electronics, 20° scanning in elevation is archived with acceptable grating lobe performance. An unequal-size element technique is introduced to further suppress the grating lobe in elevation by breaking the array periodicity. Numerical simulations and experiments demonstrate that this method has an optimal reception pattern.; Topic 2: A DSP-based real-time optical Doppler tomography system . Clinical application of Optical Doppler Tomography System (ODT) requires real-time data acquisition and signal processing. In this study, we present a real-time signal processing ODT unit based on a custom designed digital signal processing (DSP) module. The DSP is incorporated into a conventional ODT system using a grating-based scanning optical delay line. The newly developed flow velocity algorithms are integrated into the DSP and real-time data processing can be readily achieved. Phantom and animal experiments have been conducted to demonstrate the real-time imaging capability of this system.
机译：主题1：10x128元素，1.75D超声阵列的波束成形研究。 1.75D阵列允许光束转向高程，这对于在特定视场内的三维（3D）成像很有价值。 3D成像在从多个视角检测和可视化小病变方面具有重要优势。 Tetrad公司使用最新技术制造了1.75D阵列。此阵列由10行高程和128个方位角元素组成，总共1280个元素。我们构建了1280通道传输（TX）电路，1280至40复用（MUX）电路和40通道并行接收（RX）电路。除了在方位方向上的常规超声波束成形之外，还可以执行仰角扫描和聚焦，并且可以改善图像质量。使用阵列和电子设备，可以以可接受的光栅波瓣性能存档20°高程扫描。引入了不等大小的元素技术，以通过破坏阵列周期性来进一步抑制光栅波瓣的高程。数值仿真和实验表明，该方法具有最佳的接收模式。主题2：基于DSP的实时光学多普勒层析成像系统。光学多普勒断层扫描系统（ODT）的临床应用需要实时数据采集和信号处理。在这项研究中，我们提出了一种基于定制设计的数字信号处理（DSP）模块的实时信号处理ODT单元。使用基于光栅的扫描光学延迟线将DSP集成到常规ODT系统中。新开发的流速算法已集成到DSP中，可以轻松实现实时数据处理。进行了幻影和动物实验，以演示该系统的实时成像功能。

著录项

  • 作者

    Yan, Shikui.;

  • 作者单位

    University of Connecticut.;

  • 授予单位 University of Connecticut.;
  • 学科 Engineering Electronics and Electrical.; Engineering Biomedical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 132 p.
  • 总页数 132
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;生物医学工程;
  • 关键词

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