Sonoelastographic imaging of interference patterns for estimation of the shear velocity of homogeneous biomaterials.
Sonoelastographic imaging of interference patterns for estimation of the shear velocity of homogeneous biomaterials.
复制标题
干涉图案的声弹性成像用于估计均质生物材料的剪切速度。
DOI：
10.1088/0031-9155/49/6/003
复制
发表时间：
2004
影响因子：
3.5
通讯作者：
Parker,KevinJ
中科院分区：
文献类型：
--
作者：
Wu,Zhe;Taylor,LawrenceS;Rubens,DeborahJ;Parker,KevinJ
剪切波速是表征生物材料力学性能的几个重要参数之一。本文提出了两种通过检测横波干涉图来测量横波速度的非侵入性方法。在一种方法中，两个剪切波源被放置在样品的相对两侧，由相同的正弦信号驱动。来自两个声源的剪切波相互作用，产生干涉图案，通过振动超声弹性成像技术进行可视化。图案带之间的间距等于剪切波长的一半。剪切速度可以由波长和频率的乘积得到。另一种方法是以略有不同的频率驱动两个振动源。在这种情况下，干涉图案不再保持静止。证明了运动模式的视速度与介质中的剪切速度成正比。由于可以通过分析视频序列来测量图案的表观速度，因此可以获得随后的剪切速度。这些方法通过传统的横波飞行时间方法进行了验证，在各种均匀的组织模拟模型上，它们的准确率在4%以内。
The shear wave velocity is one of a few important parameters that characterize the mechanical properties of bio-materials. In this paper, two noninvasive methods are proposed to measure the shear velocity by inspecting the shear wave interference patterns. In one method, two shear wave sources are placed on the opposite two sides of a sample, driven by the identical sinusoidal signals. The shear waves from the two sources interact to create interference patterns, which are visualized by the vibration sonoelastography technique. The spacing between the pattern bands equals half of the shear wavelength. The shear velocity can be obtained by taking the product of the wavelength and the frequency. An alternative method is to drive the two vibration sources at slightly different frequencies. In this case, the interference patterns no longer remain stationary. It is proved that the apparent velocity of the moving patterns is proportional to the shear velocity in the medium. Since the apparent velocity of the patterns can be measured by analysing the video sequence, the shear velocity can be obtained thereafter. These approaches are validated by a conventional shear wave time-of-flight approach, and they are accurate within 4% on various homogeneous tissue-mimicking phantoms.