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Ultrasonic texture motion analysis: theory and simulation

机译:超声纹理运动分析:理论与仿真

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Abstract: A theoretical model was previously developed to evaluate the relationship between the dynamics of ultrasonic speckle and its underlying tissue. The model is divided into an instrumental part represented by the point spread function (in the far field) of the ultrasonic apparatus and a moving tissue component describing the changing tissue acoustical impedance structure as a function of time. In this paper, a theoretical study of the correlation between various linear transformations of the tissue and the corresponding ultrasonic speckle motion is performed, based on a 2-D extension of the envelope crosscorrelation analysis of a narrow-band gaussian noise. In the linear scan case, obviously, tissue translation generates an identical speckle translation. However, tissue/speckle motion correlation decreases with increasing rotation and/or biaxial deformation; lateral deformation (perpendicular to the beam propagation axis) being much less sensitive. With respect to the transducer frequency, the rotation and the axial deformation of the tissue shows a better relationship with their respective speckle motion at lower frequencies while lateral deformation correlation is independent of the pulse frequency. With respect to beam (pulse) size parameters, tissue/speckle correlation decreases with rotation when a wide ultrasonic beam is used while the axial deformation correlation decreases with the axial duration of the pulse. This study sets the ground for the development of an ultrasonic strain gauge particularly useful for the assessment of biomechanical soft tissue properties based on speckle tracking.!35
机译:摘要:先前已经建立了一个理论模型来评估超声散斑及其下层组织之间的关系。该模型分为由超声设备的点扩展函数(在远场中)表示的仪器部分和描述随时间变化的组织声阻抗结构变化的移动组织组件。在本文中,基于窄带高斯噪声的包络互相关分析的二维扩展,对组织的各种线性变换与相应的超声斑点运动之间的相关性进行了理论研究。显然,在线性扫描情况下,组织平移会产生相同的斑点平移。然而,组织/散斑运动的相关性随着旋转和/或双轴变形的增加而降低。横向变形(垂直于光束传播轴)的敏感度要低得多。关于换能器频率,组织的旋转和轴向变形在较低频率下与其各自的斑点运动显示出更好的关系,而横向变形相关性与脉冲频率无关。关于束(脉冲)大小参数,当使用宽的超声波束时,组织/斑点相关性随旋转而减小,而轴向变形相关性随脉冲的轴向持续时间而减小。这项研究为开发超声波应变仪奠定了基础,该超声波应变仪对基于斑点跟踪的生物力学软组织特性评估特别有用!35

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