Short-lag spatial coherence imaging
Short-lag spatial coherence imaging
复制标题
短滞后空间相干成像
DOI：
10.1109/ultsym.2010.5935711
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
J. Dahl
中科院分区：
文献类型：
--
作者：
M. Lediju;G. Trahey;Marko Jakovlijevic;B. Byram;J. Dahl
常规超声图像是通过对换能器孔径接收的背向散射回波进行延迟叠加波束形成而形成的。尽管延迟叠加波束形成器非常适合超声成像，但在非理想情况下，例如存在声学杂波和相位像差时，它会面临挑战。我们提出一种利用背向散射回波的短延迟空间相干性的替代成像方法。与匹配的B型图像相比，短延迟空间相干性（SLSC）图像在模拟产生斑点的体模目标中显示出更高的信噪比（SNR）和对比度噪声比（CNR）。在产生斑点的体模目标、人体甲状腺和羊心脏的匹配实验B型和SLSC图像中也取得了类似的结果。
Conventional ultrasound images are formed by delay-and-sum beamforming of the backscattered echoes received by the transducer aperture. Although the delay-and-sum beamformer is well suited for ultrasound image formation, it is challenged under non-ideal circumstances, such as the presence of acoustic clutter and phase aberration. We propose an alternative method of imaging utilizing the short-lag spatial coherence of the backscattered echoes. Compared to matched B-mode images, short-lag spatial coherence (SLSC) images demonstrate superior SNR and CNR in simulated speckle-generating phantom targets. Similar results are achieved in matched experimental B-mode and SLSC images of a speckle-generating phantom target, a human thyroid, and a sheep heart.