Reduction of echo decorrelation via complex principal component filtering.
Reduction of echo decorrelation via complex principal component filtering.
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DOI：
10.1016/j.ultrasmedbio.2009.01.013
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发表时间：
2009-08
影响因子：
2.9
通讯作者：
Walker, William F.
中科院分区：
文献类型：
--
作者：
Mauldin, F. William, Jr.;Viola, Francesco;Walker, William F.
关键词：
超声运动估计是临床和研究技术的基本组成部分，包括彩色血流多普勒、频谱多普勒、辐射力成像和基于超声的弹性估计。在这些应用中的每一个中，运动估计被破坏的信号去相关，起源于跨声束的非均匀目标运动。在这篇文章中，复数主成分滤波（PCF）被证明是一种滤波技术，用于显着降低血流估计和辐射力成像中的回波去相关。我们提出了各种成像条件下的仿真结果，说明了在总体回波去相关（降低≤99.9%）、均方根误差（降低≤97.3%）和位移估计的标准差（降低≤97.4%）方面，与简单带通滤波相比有了显著改善。一种辐射力成像技术，称为声流变学，应用于新鲜的全血凝固过程中，和复杂的PCF操作的返回回波。特别选择声流变学作为示例辐射力成像技术，其中回波去相关破坏运动估计。在开始凝血后2分钟，声流变学的平均回声相关性从0.996提高到0.9999，这对应于在合理的成像条件下由Cramer-Rao下限预测的运动估计方差降低41.0%。我们还应用复合PCF来改善一名23岁健康男性左颈动脉的血流速度估计。在峰值血流速度的位置，复合PCF改善了连续回波信号的相关性，平均相关性为0.94至0.998。声流变学和血流估计的改进的回声相关性产生了运动估计，其表现出更一致的响应，噪声更少。复PCF降低了散斑去相关，提高了超声运动估计的性能。
Ultrasound motion estimation is a fundamental component of clinical and research techniques that include color flow Doppler, spectral Doppler, radiation force imaging and ultrasound-based elasticity estimation. In each of these applications, motion estimates are corrupted by signal decorrelation that originates from nonuniform target motion across the acoustic beam. In this article, complex principal component filtering (PCF) is demonstrated as a filtering technique for dramatically reducing echo decorrelation in blood flow estimation and radiation force imaging. We present simulation results from a wide range of imaging conditions that illustrate a dramatic improvement over simple bandpass filtering in terms of overall echo decorrelation (≤99.9% reduction), root mean square error (≤97.3% reduction) and the standard deviation of displacement estimates (≤97.4% reduction). A radiation force imaging technique, termed sonorheometry, was applied to fresh whole blood during coagulation, and complex PCF operated on the returning echoes. Sonorheometry was specifically chosen as an example radiation force imaging technique in which echo decorrelation corrupts motion estimation. At 2 min after initiation of blood coagulation, the average echo correlation for sonorheometry improved from 0.996 to 0.9999, which corresponded to a 41.0% reduction in motion estimation variance as predicted by the Cramer-Rao lower bound under reasonable imaging conditions. We also applied complex PCF to improve blood velocity estimates from the left carotid artery of a healthy 23-year-old male. At the location of peak blood velocity, complex PCF improved the correlation of consecutive echo signals from an average correlation of 0.94 to 0.998. The improved echo correlation for both sonorheometry and blood flow estimation yielded motion estimates that exhibited more consistent responses with less noise. Complex PCF reduces speckle decorrelation and improves the performance of ultrasonic motion estimation.
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DOI：
10.1109/58.308498
发表时间：
1994-09-01
影响因子：
3.6
作者：
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通讯作者：
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DOI：
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发表时间：
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影响因子：
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DOI：
10.1109/tuffc.2002.1041080
发表时间：
2002-10-01
影响因子：
3.6
作者：
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通讯作者：
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