Hoffmeister B K, Handley S M, Wickline S A, Miller J G
Washington University, Department of Physics and School of Medicine, St. Louis, Missouri 63130, USA.
J Acoust Soc Am. 1996 Dec;100(6):3933-40. doi: 10.1121/1.417246.
The linear elastic properties of a soft tissue exhibiting a unidirectional arrangement of reinforcing fibers may be described in terms of the five independent elastic stiffness coefficients C11, C13, C33, C44, and C66. In previous studies, ultrasonic measurements of these coefficients for formalin fixed specimens of bovine Achilles tendon and normal human myocardium were reported. In the present study these results are used to analyze the anisotropy of Young's modulus of these tissues. For formalin fixed tendon a value of 1.37 GPa is obtained for Young's modulus along the fiber axis of the tissue, and a value of 0.0706 GPa is obtained perpendicular to the fibers. For formalin fixed myocardium, values of 0.101 and 0.0311 GPa parallel and perpendicular to the fibers, respectively, are obtained. Based on the results for the angular dependence of Young's modulus from unidirectional specimens of myocardium, a model is introduced to estimate these features for the more complicated fiber architecture of the left ventricular wall.
具有增强纤维单向排列的软组织的线弹性特性可以用五个独立的弹性刚度系数C11、C13、C33、C44和C66来描述。在先前的研究中，报道了对牛跟腱和正常人心肌的福尔马林固定标本的这些系数的超声测量结果。在本研究中，这些结果被用于分析这些组织的杨氏模量的各向异性。对于福尔马林固定的肌腱，沿组织纤维轴的杨氏模量值为1.37 GPa，垂直于纤维的杨氏模量值为0.0706 GPa。对于福尔马林固定的心肌，平行和垂直于纤维的杨氏模量值分别为0.101和0.0311 GPa。基于来自心肌单向标本的杨氏模量角度依赖性的结果，引入了一个模型来估计左心室壁更复杂纤维结构的这些特征。
