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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Phase aberration correction using near-field signal redundancy. I. Principles [Ultrasound medical imaging]
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Phase aberration correction using near-field signal redundancy. I. Principles [Ultrasound medical imaging]

机译：使用近场信号冗余的相位像差校正。一，原理[超声医学成像]

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摘要

The signal redundancy principle in the near field is analyzed quantitatively. It is found that common midpoint signals are not identical (or redundant) for echoes coming from arbitrary target distributions in the near field. A dynamic near-field correction is proposed to reduce the difference between common midpoint signals for echoes coming from the region of interest. When phase aberrations are present, it is shown that the dynamic correction can generally be done assuming no phase aberration, and the relative time-shift between common midpoint signals can be used to measure phase-aberration profiles. A phase-aberration correction algorithm based on that principle is proposed. In this algorithm, after common midpoint signals are collected they are dynamically corrected for near-field effects and cross-correlated with one another. In a related way, the phase errors are measured from peak positions of these cross-correlation functions. The phase-aberration profile across the array is derived from these measurements. The relationship between the errors in the derived phase aberration profile and the errors in the measured relative time-shift between common midpoint signals is derived. A method for treating the situation of different transmission and reception phase-aberration profiles is also proposed. This algorithm works for general target distributions, iteration is not required, and it can be used in other near-field, pulse-echo, imaging systems.
机译：对近场信号冗余原理进行了定量分析。发现对于来自近场中任意目标分布的回波，公共中点信号并不相同（或冗余）。提出了一种动态近场校正，以减小来自感兴趣区域的回声的公共中点信号之间的差异。当存在相位像差时，表明通常可以在不假设相位像差的情况下进行动态校正，并且可以使用公共中点信号之间的相对时移来测量相位像差曲线。提出了基于该原理的相位像差校正算法。在这种算法中，在收集到共同的中点信号后，会对它们进行动态校正以产生近场效应，并相互交叉关联。以相关的方式，从这些互相关函数的峰值位置测量相位误差。从这些测量中得出整个阵列上的相差分布。推导得出的相差像差中的误差与所测量的公共中点信号之间的相对时移中的误差之间的关系。还提出了一种处理不同的发射和接收相位像差情况的方法。该算法适用于一般目标分布，不需要迭代，可以在其他近场，脉冲回波成像系统中使用。

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