相关实验视频
Updated: Jun 23, 2025

06:07
Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
12.6K
基于超声波的粘弹性评价声波辐射力诱导的纵向剪切波
Hsiao-Chuan Liu1, Hyoung-Ki Lee2, Matthew W Urban3
1Department of Ophthalmology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
Ultrasonics
|June 26, 2024
概括
由声辐射力诱导的纵向剪切波 (LSW) 现在可以使用超声波探测组织粘性弹性. 反射LSWs (RLSWs) 克服了能量限制,使得可以准确地测量剪切模量和粘度.
科学领域:
- 生物医学超声波 生物医学超声波
- 生物机械性质评估评估
- 声波辐射强度 (ARF) 应用
背景情况:
- 声波辐射力 (ARF) 是诱导剪切波 (SWs) 评估生物组织力学的关键.
- 虽然横向SWs被广泛使用,但纵向剪切波 (LSWs) 提供局部性质评估,尽管通常受到能量限制,并通过光学连贯断层扫描 (OCT) 进行评估.
研究的目的:
- 用超声波研究ARF诱导的LSW在探测局部粘弹性特性 (剪切模量和粘度) 的潜力.
- 通过使用反射式LSW (RLSW) 方法来解决LSW能源不足问题.
主要方法:
- 使用ARF生成LSW并使用表面边界效应创建RLSW.
- 使用模仿组织的粘弹性幻体进行系统的实验评估.
- 通过数值模拟验证和与传统SW测量进行比较.
- 凯尔文-沃伊格特 (KV) 模型用于确定粘弹性参数的应用.
主要成果:
- RLSWs有效地解决了ARF引起的LSWs的能量不足.
- 在模拟和实验中,RLSW和SW方法的相速和分散结果显示出很好的一致性.
- 使用KV模型实现了切削模量和粘度的准确确定.
结论:
- 由ARF诱导的RLSW提供了一种可行的基于超声波的方法,用于评估生物组织的局部粘弹性特性.
- 这种技术克服了以前的局限性,并具有重要的生物医学应用潜力,包括评估异质材料和微观组织损伤.
相关概念视频
Sound as Pressure Waves
2.4K
Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
The pressure fluctuation depends on the difference in displacements between the successive points in the...
2.4K
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
263
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
263
Deriving the Speed of Sound in a Liquid
497
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
The speed of sound in fluids can be derived by considering a mechanical wave...
497

