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相关概念视频

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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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...
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Strain and Elastic Modulus01:15

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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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.
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测定肌硬度:二维与点剪波弹性图

Mario Pasurka1, Theo Falck1, Joshua Kubach1

  • 1Department of Orthopaedic and Trauma Surgery, University Hospital of Erlangen, Friedrich-Alexander-University Erlangen-Nuremberg, Krankenhaus 9, 91054, Erlangen, Germany.

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概括
此摘要是机器生成的。

这项研究比较了点剪波弹性图 (pSWE) 和二维剪波弹性图 (2D-SWE) 来评估骨肌硬度. 这两种方法都显示出出色的可靠性,2D-SWE1在临床使用中更快,更可靠.

关键词:
声波辐射力冲动成像肌肉骨超声波检查点切波弹性学肌硬化二维切割波弹性图

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科学领域:

  • 肌肉骨超声波检查
  • 医学成像物理
  • 生物力学

背景情况:

  • 肌硬度评估对于诊断和管理肌病至关重要.
  • 剪波弹性图 (SWE) 提供了非侵入性的定量硬度测量.
  • 在 PT 评估中,点 SWE (pSWE) 和 2D SWE (2D-SWE) 的可比性尚未确定.

研究的目的:

  • 为了比较pSWE和2D-SWE的诊断准确性和可靠性,以评估骨硬度.
  • 评估pSWE和2D-SWE技术的内部和内部可靠性.
  • 评估和比较pSWE和2D-SWE所需的测量时间.

主要方法:

  • 40名健康参与者接受了B模式超声波,彩色多普勒超声波和骨肌的SWE (pSWE和2D-SWE).
  • 记录了硬度值 (剪切波速度) 和测量持续时间.
  • 两位研究人员在两个时间点评估了评价者内部和评价者之间的可靠性.

主要成果:

  • pSWE的刚度值略高 (4.02 ± 1.07 m/s) 比2D-SWE (3.82 ± 0.73 m/s) (p < 0.001).
  • 一次测量 (2D-SWE1) 的2D-SWE比p-SWE (54.85 ± 8.34秒) 显著更快 (47.20 ± 8.23秒).
  • 这两种方法都表现出极好的内部和内部可靠性,2D-SWE1产生了最高的ICC值.

结论:

  • 这是第一个比较pSWE和2D-SWE用于骨硬度的研究.
  • 2D-SWE,特别是2D-SWE1,为临床肌肉骨超声波提供了可靠和时间效率高的替代方案.
  • 这些发现支持2D-SWE在评估肌特性方面的潜在临床实用性.