ESTIMATION OF SHEAR ELASTICITY OF BIOTISSUES USING SURFACE WAVES

使用表面波估计生物问题的剪切弹性

• 批准号: 08680939
• 负责人: CHOI Pak-kon
• 金额: $ 1.34万
• 依托单位: MEIJI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08680939/
• 关键词: Biotissues; Surface waves; Shear elasticity; Gel; Chicken breast muscle; Bovine myocardium; Bovine lever; 牛レバ-; ゾル-ゲル転移

A noble experiment was made, aiming to measure shear elasticity in soft materials such as biotissues and gels using suf ace acoustic waves. Extensive ultrasonic studies have been made in biotissues. However, very few studies on shear elasticity have been reported. In the present study surface wave velocity and absorption were measured in fibrous tissues, chicken breast muscle and bovine myocardium. The shear elasticity derived from the surface wave properties showed large direction dependence along the fibrous structure. This is marked contrast with the ultrasonic properties which showed small direction dependence. Elastic stiffness tensors were determined in these tissues.Propagation of surface waves has not been clarified in the case that both surface tension and elasticity are operating as a restoring force. I and Prof.Y.Onodera of meiji University have derived the dispersion equation and have found that two kinds of surface wave modes are able to propagate in a gel state : Rayleigh type surface waves and leaky surface tension waves. The latter was predicted for the first time. The surface wave measurementsin gelatin sol and gel showed the exsitence of the two modes. The present study provides a new tool for investigating elasticity in soft materials.

进行了一项伟大的实验，旨在使用表面声波测量生物组织和凝胶等软材料的剪切弹性。人们对生物组织进行了广泛的超声波研究。然而，关于剪切弹性的研究报道甚少。在本研究中，测量了纤维组织、鸡胸肌和牛心肌的表面波速度和吸收。由表面波特性得出的剪切弹性显示出沿纤维结构的较大方向依赖性。这与显示出较小方向依赖性的超声波特性形成鲜明对比。在这些组织中确定了弹性刚度张量。在表面张力和弹性都充当恢复力的情况下，表面波的传播尚未阐明。我和明治大学的Y.Onodera教授推导了色散方程，发现两种表面波模式能够在凝胶状态下传播：瑞利型表面波和泄漏表面张力波。后者是首次被预测。明胶溶胶和凝胶中的表面波测量表明两种模式的存在。本研究为研究软材料的弹性提供了一种新工具。

项目成果

A.Yamamoto and P.-K.Choi: ""Ultrasonic velocity and absorption studies on gelation in gelatin (in Japanese)"" J,Acoust.Soc.Jpn.53. 179-184 (1997)

A.Yamamoto 和 P.-K.Choi：“明胶凝胶的超声速度和吸收研究（日语）”J,Acoust.Soc.Jpn.53。

H.Takahashi,P-K.Choi: "Sol-Gel Transition in Gelatin Observod with Surface Waves" Jpn.J.Appl.Phys.35巻5B. 2939-2943 (1996)

H.Takahashi,P-K.Choi：“用表面波观察明胶中的溶胶-凝胶转变”Jpn.J.Appl.Phys.35, 5B 2939-2943 (1996)。

Y.Onodera,P.-K.Choi: "Surface-wave modes on soft gels" J.Acoust.Soc.Am.104(6). 3358-3363 (1998)

Y.Onodera,P.-K.Choi：“软凝胶上的表面波模式”J.Acoust.Soc.Am.104(6)。

H.Takahashi and P.-K.Choi: ""Sol-gel transition in gelatin observed with surface waves"" Jpn.J.Appl.Phys. vol.35, (5B). 2939-2943 (1996)

H.Takahashi 和 P.-K.Choi：“用表面波观察明胶中的溶胶-凝胶转变”Jpn.J.Appl.Phys。

H.Takahashi, P-K.Choi: "Sol-Gel Transition ingelatin observed with surface waves" Jpn.J.Appl.Phys.35. 2939-2943 (1996)

H.Takahashi、P-K.Choi：“用表面波观察明胶的溶胶-凝胶转变”Jpn.J.Appl.Phys.35。