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相关概念视频

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

199
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
199
Shear on the Horizontal Face of a Beam Element01:16

Shear on the Horizontal Face of a Beam Element

180
To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
180

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相关实验视频

Updated: Jul 13, 2025

Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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三维剪切波弹性图使用2D行列定位 (RCA) 阵列.

Zhijie Dong1,2, Jihun Kim1,2,3, Chengwu Huang4

  • 1Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, IL, USA.

BME frontiers
|October 18, 2023
PubMed
概括
此摘要是机器生成的。

一种新的3D剪波弹性图 (SWE) 技术使用2D行列定位 (RCA) 阵列进行高体积率成像. 这种方法可以进行可靠的3D组织硬度评估,为临床转化铺平了道路.

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科学领域:

  • 超声波成像 超声波成像
  • 生物医学工程 生物医学工程
  • 医学物理 医学物理

背景情况:

  • 剪波弹性图 (SWE) 量化了组织度,这对于诊断癌症和肝纤维化等疾病至关重要.
  • 目前的SWE技术仅限于2D,因为高体积率3D成像的挑战.
  • 3D成像对于准确评估异质组织特性至关重要.

研究的目的:

  • 开发一种使用二维行列定位 (RCA) 阵列的新型3D剪切波弹性图 (SWE) 技术.
  • 为了使3D SWE使用外部振动或声辐射力 (ARF) 作为剪切波源.
  • 提供低成本,高容量率的解决方案,与现有的临床超声波系统兼容.

主要方法:

  • 开发了一种3D SWE方法,采用2D RCA阵列,达到高达2000Hz的音量率.
  • 使用模仿组织弹性幻象来评估该技术的性能.
  • 在体内验证通过一个案例研究进行.

主要成果:

  • 成功检测了由外部振动和ARF引起的3D剪切波运动.
  • 对幻影和体内数据进行强大的3D剪切波速度图的重建.
  • 展示高体积率的3D成像能力.

结论:

  • 使用2D RCA阵列开发的3D SWE技术为体积组织硬度评估提供了一个实用的解决方案.
  • 该方法支持3D SWE的临床翻译,提供了一个具有成本效益和高容量率的替代方案.
  • 这一进步解决了二维SWE的局限性,并促进了全面的组织评估.