Harmonic spatial coherence imaging: an ultrasonic imaging method based on backscatter coherence.
Harmonic spatial coherence imaging: an ultrasonic imaging method based on backscatter coherence.
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DOI：
10.1109/tuffc.2012.2243
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发表时间：
2012-04
期刊：
影响因子：
--
通讯作者：
Trahey GE
中科院分区：
文献类型：
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作者：
Dahl J;Jakovljevic M;Pinton GF;Trahey GE
HSCI和SLSC成像对杂波不太敏感，因为它具有低空间相干性。该方法是基于二次谐波后向散射的相干性。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，所以利用谐波成像获得的益处也适用于HSCI。谐波成像已经成为诊断超声成像中抑制杂波的主要工具，然而二次谐波回波不一定不受杂波的影响。HSCI和SLSC成像对杂波不太敏感，因为它具有低空间相干性。与基波和谐波B模式成像相比，谐波空间相干成像显示出良好的成像特性，例如改善的对比度噪声比（CNR）、改善的散斑信噪比（SNR）以及更好的边界和其他结构描绘。从HSCI人体心脏组织的体内成像中获得了高达1.9的CNR，相比之下，在基波B模式、谐波B模式和SLSC成像中分别为0.6、0.9和1.5。在人体肝脏组织中的体内实验表明，与谐波B模式的1.9相比，HSCI的SNR高达3.4。心脏腔室模型的非线性模拟与体内实验一致。
HSCI and SLSC imaging less sensitive to clutter because it has low spatial coherence. 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 applicable to HSCI. Harmonic imaging has been the primary tool for suppressing clutter in diagnostic ultrasound imaging, however second harmonic echoes are not necessarily immune to the effects of clutter. HSCI and SLSC imaging are less sensitive to clutter because it has low spatial coherence. Harmonic Spatial Coherence Imaging shows favorable imaging characteristics such as improved contrast-to-noise ratio (CNR), improved speckle signal-to-noise ratio (SNR), and better delineation of borders and other structures compared to 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 to 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 to 1.9 for harmonic B-mode. Nonlinear simulations of a heart chamber model were consistent with the in vivo experiments.