Speckle motion artifact under tissue rotation
Speckle motion artifact under tissue rotation
复制标题
组织旋转下的散斑运动伪影
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
J. Meunier
中科院分区：
文献类型：
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作者：
F. Kallel;M. Bertrand;J. Meunier
超声图像中的散斑图案可以以与对应组织的运动没有简单关系的方式移动。在某些情况下，散斑运动复制了潜在的组织运动，在其他情况下则不是。作者将散斑与潜在组织运动之间的差异称为“散斑运动伪影”。利用回波成像模型研究了高斯波束线性扫描成像系统观察到的旋转体模产生的运动伪影。作者提出，当组织被建模为一个随机阵列的小和众多的散射体，这样的运动像差被占的2D相位特性的成像系统。提出了这种运动伪影与成像系统特性（波束宽度、换能器频率、脉冲持续时间）的关系的分析预测。结果表明，伪影的结果从系统点扩散函数的曲率，这反过来又决定了2D相位特性的曲率。据作者所知，这是第一次提出一个全面的超声散斑运动伪影模型。该模型已被开发用于研究旋转引起的伪影;然而，该方法是相当普遍的，可以扩展到研究其他组织运动的影响，特别是变形和剪切。<<ETX>>
Speckle patterns in ultrasound images may move in a way which bears no simple relationship to the motion of the corresponding tissues. In some instances the speckle motion replicates the underlying tissue motion, in others it does not. The authors name "speckle motion artifact" the difference between the speckle and the underlying tissue motion. An echographic image formation model is used to study the motion artifact produced by a rotating phantom and observed by a linear scan imaging system with a Gaussian beam. The authors propose that when the tissue is modeled as a random array of small and numerous scatterers, such motion aberration be accounted for by the 2D phase characteristics of the imaging system. An analytic prediction of this motion artifact in relation to the imaging system characteristics (beam width, transducer frequency, pulse duration) is presented. It is shown that the artifact results from the curvature of the system point spread function, which in turn determines the curvature of the 2D phase characteristics. To the authors' knowledge, it is the first time a comprehensive model of ultrasonic speckle motion artifact is presented. The model has been developed to study rotation-induced artifact; the method is however quite general and can be extended to study the effects of other tissue motion, in particular deformation and shear.<<ETX>>