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United Wiener postfilter for plane wave compounding ultrasound imaging
Ultrasonics ( IF 3.8 ) Pub Date : 2021-01-28 , DOI: 10.1016/j.ultras.2021.106373
Yanxing Qi , Yinmeng Wang , Yuanyuan Wang

Plane wave compounding (PWC) is a valid method for ultrafast ultrasound imaging. Its imaging quality depends on the beamforming method. The coherence factor (CF) and Wiener postfilter are effective signal processing schemes for aberration correction. However, the CF usually causes over-suppression and brings artifacts. Additionally, the conventional CF and Wiener postfilter cannot fully utilize the spatial coherence in the PWC, which limits the imaging performance and increases the computation. In this paper, we propose a united Wiener postfilter specially for the PWC. The signal and noise power are both estimated through the echo signal matrix, rather than array signal vectors. The method also accords with the theoretical relationship between the CF and Wiener. To evaluate the performance of the proposed method, we conduct simulations, phantom and in vivo experiments and make comparisons with the delay-and-sum (DAS), the CF, the generalized coherence factor (GCF), the conventional Wiener and the scaled Wiener beamformers. Results indicate that our method can offer the better resolution and contrast than the DAS and Wiener. It also solves the over-suppression drawback of the CF. Specifically, the contrast ratio and contrast-to-noise ratio achieve 26.7% and 25.2% improvements in simulations, 28.7% and 32.4% in phantom experiments, respectively. The proposed method also performs well in terms of the speckle signal-to-noise ratio and the generalized contrast-to-noise ratio. Consequently, we believe that the proposed method is effective in enhancing the imaging quality of the PWC.



中文翻译:

联合维纳后置滤波器用于平面波复合超声成像

平面波复合(PWC)是用于超快超声成像的有效方法。其成像质量取决于波束形成方法。相干因子(CF)和维纳后置滤波器是用于像差校正的有效信号处理方案。但是,CF通常会导致过度抑制并带来伪影。此外,常规的CF和Wiener后置滤波器无法充分利用PWC中的空间相干性,这限制了成像性能并增加了计算量。在本文中,我们提出了一种专用于PWC的统一Wiener后置滤波器。信号和噪声功率均通过回波信号矩阵而不是阵列信号矢量进行估计。该方法还符合CF和维纳之间的理论关系。为了评估所提出方法的性能,我们进行了仿真,幻像和体内实验,并与延迟和(DAS),CF,广义相干因子(GCF),常规维纳和成比例的维纳波束形成器进行比较。结果表明,与DAS和Wiener相比,我们的方法可以提供更好的分辨率和对比度。它还解决了CF的过度抑制缺点。具体而言,在模拟中,对比度和对比度噪声比分别提高了26.7%和25.2%,在幻像实验中分别提高了28.7%和32.4%。所提出的方法在斑点信号噪声比和广义对比度噪声比方面也表现良好。因此,我们相信所提出的方法在增强PWC的成像质量方面是有效的。广义相干因子(GCF),常规维纳和成比例的维纳波束形成器。结果表明,与DAS和Wiener相比,我们的方法可以提供更好的分辨率和对比度。它还解决了CF的过度抑制缺点。具体而言,在模拟中,对比度和对比度噪声比分别提高了26.7%和25.2%,在幻像实验中分别提高了28.7%和32.4%。所提出的方法在斑点信号噪声比和广义对比度噪声比方面也表现良好。因此,我们相信所提出的方法在增强PWC的成像质量方面是有效的。广义相干因子(GCF),常规维纳和成比例的维纳波束形成器。结果表明,与DAS和Wiener相比,我们的方法可以提供更好的分辨率和对比度。它还解决了CF的过度抑制缺点。具体而言,在模拟中,对比度和对比度噪声比分别提高了26.7%和25.2%,在幻像实验中分别提高了28.7%和32.4%。所提出的方法在斑点信号噪声比和广义对比度噪声比方面也表现良好。因此,我们相信所提出的方法在增强PWC的成像质量方面是有效的。它还解决了CF的过度抑制缺点。具体而言,在模拟中,对比度和对比度噪声比分别提高了26.7%和25.2%,在幻像实验中分别提高了28.7%和32.4%。所提出的方法在散斑信号噪声比和广义对比度噪声比方面也表现良好。因此,我们相信所提出的方法在增强PWC的成像质量方面是有效的。它还解决了CF的过度抑制缺点。具体而言,在模拟中,对比度和对比度噪声比分别提高了26.7%和25.2%,在幻像实验中分别提高了28.7%和32.4%。所提出的方法在斑点信号噪声比和广义对比度噪声比方面也表现良好。因此,我们相信所提出的方法在增强PWC的成像质量方面是有效的。

更新日期:2021-01-31
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