Minimization of displacement estimation bias due to high amplitude-reflections using envelope-weighted normalization.

Minimization of displacement estimation bias due to high amplitude-reflections using envelope-weighted normalization.
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DOI:
10.1177/016173461003200201
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发表时间:
2010-04
期刊:
影响因子:
2.3
通讯作者:
McAleavey S
McAleavey S
中科院分区:
工程技术4区
文献类型:
--
作者:
Menon M;Langdon J;McAleavey S

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在弹性成像中,位移估计通常使用基于互相关的技术来执行,假设完全发展的均匀散斑。在回波幅度存在局部大变化的情况下,例如来自血管壁的反射,该假设不成立,导致偏移位移估计。在位移估计之前通过其包络对回波进行归一化以较大的抖动误差为代价来减小这种影响。提出了一种算法,以减少位移估计中的幅度依赖性偏差,同时避免抖动误差幅度的大幅增加。该算法包括在位移估计之前对回波数据进行“包络加权归一化”(EWN)。进行了参数分析,以找到最佳参数,该技术可以实现。EWN技术被发现显着减少的RMS误差的位移估计显示最大的改善时,利用较长的窗口长度和较高的超声波频率。
In elastography, displacement estimation is often performed using cross-correlation based techniques, assuming fully-developed, homogeneous speckle. In the presence of a local, large variation in echo amplitude, such as a reflection from a vessel wall, this assumption does not hold true, resulting in a biased displacement estimate. Normalizing the echo by its envelope before displacement estimation reduces this effect at the cost of larger jitter errors. An algorithm is proposed to reduce amplitude-dependent bias in displacement estimates while avoiding a large increase in the jitter error magnitude. The algorithm involves “Envelope-Weighted Normalization” (EWN) of echo data before displacement estimation. A parametric analysis was conducted to find the optimum parameters with which this technique could be implemented. The EWN technique was found to significantly reduce the RMS error of the displacement estimates showing the greatest improvements when utilizing longer window lengths and higher ultrasonic frequencies.
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