Goldmann Tomás, Seiner Hanus, Landa Michal
Department of Mechanics, Biomechanics and Mechatronics, Faculty of Mechanical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
Technol Health Care. 2006;14(4-5):219-32.
Elastic properties of single parts of a human skeleton are necessary to know for modelling bone tissue-implants interactions as well as for diagnostic purposes. This paper contributes to the methodology of the evaluation of elastic properties of bones by the ultrasonic wave inversion. The method was developed on composite structures such as plates and cylindrical shells. Final results are then demonstrated on the bovine cortical bone specimen. Properties are supposed to exhibit an orthotropic or a transversally isotropic symmetry. Quasi-longitudinal and quasi-transversal waves are generated from the wave diffraction on the liquid/specimen interface. Wave velocity fields obtained by the ultrasonic scanning technique are used as an input to the inversion procedure for all elastic constants determination. Experimental results are confronted with the numerical modelling of the wave propagation and the stability of resulting data is evaluated by the statistical method based on the Monte-Carlo simulation. The suggested approach has a potential for the qualify of such measurements performed on fresh bones and also for improvement in-situ ultrasonic techniques.
了解人体骨骼单个部分的弹性特性对于模拟骨组织与植入物的相互作用以及诊断目的而言是必要的。本文通过超声波反演法对评估骨骼弹性特性的方法做出了贡献。该方法是在诸如板和圆柱壳等复合结构上开发的。然后在牛皮质骨标本上展示了最终结果。假定这些特性呈现正交各向异性或横向各向同性对称。准纵波和准横波是由液体/标本界面上的波衍射产生的。通过超声扫描技术获得的波速场被用作确定所有弹性常数的反演程序的输入。将实验结果与波传播的数值模拟进行对比，并通过基于蒙特卡洛模拟的统计方法评估所得数据的稳定性。所提出的方法对于在新鲜骨骼上进行此类测量的质量以及改进原位超声技术具有潜力。
