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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >The progressive focusing correction technique for ultrasound beamforming
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The progressive focusing correction technique for ultrasound beamforming

机译：超声波束成形的渐进聚焦校正技术

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摘要

This work presents a novel method for digital ultrasound beamforming based on programmable table look-ups, in which vectors containing coded focusing information are efficiently stored, achieving an information density of a fraction of bit per acquired sample. Timing errors at the foci are within half the period of a master clock of arbitrarily high frequency to improve imaging quality with low resource requirements. The technique is applicable with conventional as well as with DeltaSigma converters. The bit-width of the focusing code and the number of samples per focus can be defined to improve both memory size and F# with controlled timing errors. In the static mode, the number of samples per focus is fixed, and in the dynamic approach that figure grows progressively, taking advantage of the increasing depth of focus. Furthermore, the latter has the lowest memory requirements. The technique is well suited for research purposes as well as for real-world applications, offering a degree of freedom not available with other approaches. It allows, for example, modifying the sampling instants to phase aberration correction, beamforming in layered structures, etc. The described modular and scalable prototype has been built using low-cost field programmable gate arrays (FPGAs). Experimental measurements are in good agreement with the theoretically expected errors
机译：这项工作提出了一种基于可编程表格查找的数字超声波束形成的新方法，其中有效地存储了包含编码聚焦信息的矢量，从而实现了每个采集样本的信息密度仅为几分之一。焦点处的定时误差在任意高频率的主时钟周期的一半以内，从而以较低的资源需求提高了成像质量。该技术适用于常规转换器和DeltaSigma转换器。可以定义聚焦代码的位宽和每个聚焦的样本数，以在控制定时误差的情况下提高内存大小和F＃。在静态模式下，每个焦点的样本数量是固定的，而在动态方法下，图形会利用不断增加的焦点深度逐渐增长。此外，后者具有最低的内存要求。该技术非常适合研究目的以及实际应用，提供了其他方法无法提供的自由度。例如，它允许修改采样时刻以进行相差校正，分层结构中的波束成形等。所描述的模块化和可扩展原型是使用低成本现场可编程门阵列（FPGA）构建的。实验测量与理论上的预期误差高度吻合

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