Li Sinan, Cheng Yi, Song Lipei, Eckersley Robert J, Elson Daniel S, Tang Meng-Xing
Opt Lett. 2014 Mar 15;39(6):1597-600. doi: 10.1364/OL.39.001597.
Shear wave propagation provides rich information for material mechanical characterization, including elasticity and viscosity. This Letter reports tracking of shear wave propagation in turbid media by laser-speckle-contrast analysis. The theory is described, and a Monte Carlo simulation of light shear wave interaction was developed. Simulation and experiments on tissue-mimicking phantoms agree well and show tracking of shear wave at the phantom surface and at depth as well as multiple shear waves interacting within the object. The relationship between speckle contrast value and shear wave amplitude is also investigated.
剪切波传播为材料力学特性表征提供了丰富信息，包括弹性和粘度。本信函报道了通过激光散斑对比度分析对浑浊介质中剪切波传播的跟踪。描述了该理论，并开展了光与剪切波相互作用的蒙特卡罗模拟。在仿组织体模上进行的模拟和实验结果吻合良好，显示出在体模表面和深度处对剪切波的跟踪，以及物体内部多个剪切波的相互作用。还研究了散斑对比度值与剪切波振幅之间的关系。
