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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Harmonic spatial coherence imaging: an ultrasonic imaging method based on backscatter coherence
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Harmonic spatial coherence imaging: an ultrasonic imaging method based on backscatter coherence

机译：谐波空间相干成像：基于反向散射相干的超声成像方法

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摘要

We introduce a harmonic version of the short-lag spatial coherence (SLSC) imaging technique, called harmonic spatial coherence imaging (HSCI). The method is based on the coherence of the second-harmonic backscatter. Because the same signals that are used to construct harmonic B-mode images are also used to construct HSCI images, the benefits obtained with harmonic imaging are also obtained with HSCI. Harmonic imaging has been the primary tool for suppressing clutter in diagnostic ultrasound imaging, however secondharmonic echoes are not necessarily immune to the effects of clutter. HSCI and SLSC imaging are less sensitive to clutter because clutter has low spatial coherence. HSCI shows favorable imaging characteristics such as improved contrast-to-noise ratio (CNR), improved speckle SNR, and better delineation of borders and other structures compared with fundamental and harmonic B-mode imaging. CNRs of up to 1.9 were obtained from in vivo imaging of human cardiac tissue with HSCI, compared with 0.6, 0.9, and 1.5 in fundamental B-mode, harmonic B-mode, and SLSC imaging, respectively. In vivo experiments in human liver tissue demonstrated SNRs of up to 3.4 for HSCI compared with 1.9 for harmonic B-mode. Nonlinear simulations of a heart chamber model were consistent with the in vivo experiments.
机译：我们介绍了短时空间相干成像（SLSC）成像技术的谐波版本，称为谐波空间相干成像（HSCI）。该方法基于二次谐波反向散射的相干性。因为用于构建谐波B模式图像的相同信号也用于构建HSCI图像，所以使用HSCI也可以获得通过谐波成像获得的好处。谐波成像已成为诊断超声成像中抑制杂波的主要工具，但是二次谐波回波不一定不受杂波影响。 HSCI和SLSC成像对杂波较不敏感，因为杂波的空间相干性较低。与基本和谐波B模式成像相比，HSCI显示出良好的成像特性，例如，改进的对比度-噪声比（CNR），改进的斑点SNR，更好的边界和其他结构轮廓。使用HSCI对人体心脏组织进行体内成像可获得高达1.9的CNR，而基本B型，谐波B模式和SLSC成像的CNR分别为0.6、0.9和1.5。在人体肝脏组织中的体内实验表明，HSCI的SNR高达3.4，而谐波B模式的SNR为1.9。心室模型的非线性模拟与体内实验一致。

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