背散射回波的短时滞空间相干性：成像特征。
Short-lag spatial coherence of backscattered echoes: imaging characteristics.
机构信息
Department of Biomedical Engineering, Duke University, Durham, NC, USA.
出版信息
IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Jul;58(7):1377-88. doi: 10.1109/TUFFC.2011.1957.
Abstract
Conventional ultrasound images are formed by delay-and-sum beamforming of the backscattered echoes received by individual elements of the transducer aperture. Although the delay-and-sum beamformer is well suited for ultrasound image formation, it is corrupted by speckle noise and challenged by acoustic clutter and phase aberration. We propose an alternative method of imaging utilizing the short-lag spatial coherence (SLSC) of the backscattered echoes. Compared with matched B-mode images, SLSC images demonstrate superior SNR and contrast-to-noise ratio in simulated and experimental speckle-generating phantom targets, but are shown to be challenged by limited point target conspicuity. Matched B-mode and SLSC images of a human thyroid are presented. The challenges and opportunities of real-time implementation of SLSC imaging are discussed.
摘要
传统的超声图像是通过对换能器孔径中各个单元接收到的背散射回波进行延迟求和波束形成得到的。虽然延迟求和波束形成器非常适合超声成像，但它会受到散斑噪声的干扰，并且受到声杂波和相位误差的影响。我们提出了一种利用背散射回波的短滞后空间相干性（SLSC）的成像方法。与匹配的 B 型模式图像相比，SLSC 图像在模拟和实验的散斑生成体模目标中表现出更高的 SNR 和对比度噪声比，但在有限的点目标可见度方面受到挑战。本文展示了人甲状腺的匹配 B 型模式和 SLSC 图像。讨论了实时实现 SLSC 成像的挑战和机遇。
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