Coherence beamforming and its applications to the difficult-to-image patient
Coherence beamforming and its applications to the difficult-to-image patient
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相干波束形成及其在难以成像患者中的应用
DOI：
10.1109/ultsym.2017.8091607
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
G. Trahey
中科院分区：
文献类型：
--
作者：
J. Dahl;D. Hyun;Y. Li;M. Jakovljevic;M. Bell;Will Long;Nick Bottenus;V. Kakkad;G. Trahey
超声图像质量差以及成像目标可视化不充分或次优是超重或肥胖个体的常见问题。声学混响是一种不相干的噪声源，是超重和肥胖个体的常见因素，也是导致图像质量差的重要原因。具体来说，扩散声混响是有问题的，因为它看起来与超声图像中的常见组织纹理相似，从而加剧了不充分和次优的可视化。我们描述了称为短滞后空间相干（SLSC）波束形成器的相干成像技术及其相关成像方法，作为解决不充分和次优可视化问题的潜在解决方案。 SLSC 波束形成器检测反向散射超声波的空间相似性，更强调紧密间隔位置的空间相似性。由于扩散混响在波场中在空间上不相干，因此可以将噪声与组织和其他所需的成像目标区分开来。综述了 SLSC 波束形成器在体内成像中的应用以及该技术对其他成像模式（包括流成像、分子超声成像和光声成像）的适应。尽管计算量比传统的延迟求和波束形成更加密集，但我们描述了几种快速计算相干性的技术，从而实现实时成像。回顾了空间相干波束形成的挑战和批评，包括相位信息的损失和该技术的非线性行为。
Poor quality ultrasound images and inadequate or suboptimal visualization of imaging targets is a common problem in individuals that are overweight or obese. Acoustic reverberation is an incoherent noise source that is a common factor in overweight and obese individuals and is a significant contributor to the poor image quality. Specifically, diffuse acoustic reverberation is problematic because it appears similar to common tissue texture in ultrasound images, thereby exacerbating the inadequate and suboptimal visualization. We describe the coherence imaging technique called the short-lag spatial coherence (SLSC) beamformer and its related imaging methods as potential solutions to the inadequate and suboptimal visualization problem. The SLSC beamformer detects the spatial similarity of the backscattered ultrasound waves, with a greater emphasis on the spatial similarity at closely-spaced positions. Because diffuse reverberation is spatially incoherent in the wavefield, noise can be differentiated from tissue and other desired imaging targets. Applications of the SLSC beamformer to in vivo imaging and adaptations of the technique to other imaging modalities, including flow imaging, molecular ultrasound imaging, and photoacoustic imaging are reviewed. Although computationally more intensive than conventional delay-and-sum beamforming, we describe several techniques for fast computation of coherence, which enable real-time imaging. The challenges and criticisms of spatial coherence beamforming are reviewed, including the loss in phase information and the nonlinear behavior of the technique.
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DOI：
10.1121/1.1511756
发表时间：
2002
期刊：
The Journal of the Acoustical Society of America
影响因子：
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影响因子：
2.4
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DOI：
10.1121/1.408348
发表时间：
1994
期刊：
The Journal of the Acoustical Society of America
影响因子：
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Waag,RC