Antich P, Mehta S
Department of Radiology, University of Texas Southwestern Medical Center, Dallas 75235, USA.
Phys Med Biol. 1997 Sep;42(9):1763-77. doi: 10.1088/0031-9155/42/9/008.
This paper discusses the measurement of velocity in a solid based on the analysis of the amplitude and phase of ultrasound waves reflected by a solid, a technique called ultrasound critical-angle reflectometry (UCR). To this end, the complete formulation of ultrasound wave reflection and refraction from a liquid-solid interface is described. Differences between this formulation and previously published ones are briefly discussed. Based on this analysis it is in particular possible to measure by this technique not only pressure but also, for the first time in such studies, shear wave velocities, an experimentally confirmed result. The measurement of the complete stiffness matrix of a transversely isotropic solid, specifically cortical bone, by applying UCR elastometry to any point on the solid's surface is demonstrated. Finally this method is extended to functional elastometric imaging. The techniques presented in this paper offer new opportunities for applications of UCR imaging to the assessment of bone metabolism, formation and disease and also the analysis of composite materials in general.
本文基于对固体反射超声波的振幅和相位分析，讨论了固体中速度的测量方法，这种技术称为超声临界角反射法（UCR）。为此，描述了超声波从液 - 固界面反射和折射的完整公式。简要讨论了该公式与先前发表的公式之间的差异。基于此分析，通过该技术不仅可以测量压力，而且在这类研究中首次能够测量剪切波速度，这是一个经过实验证实的结果。展示了通过将UCR弹性测定法应用于固体表面的任何点来测量横向各向同性固体（特别是皮质骨）的完整刚度矩阵。最后，该方法扩展到功能弹性成像。本文提出的技术为UCR成像在骨代谢、形成和疾病评估以及一般复合材料分析中的应用提供了新的机会。
