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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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Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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临床前持续振动剪切波弹性图形的实施和可重复性.

John Civale1, Vaidesh Parasaram1, Jeffrey C Bamber1

  • 1Division of Radiotherapy and Imaging, The Institute of Cancer Research, 32 Oakleaf Avenue, London, SM2 5PG, United Kingdom.

Physics in medicine and biology
|December 8, 2025
PubMed
概括

这项研究表明,3D剪波弹性图 (SWE) 是一种可重复的技术,用于在临床前模型中测量瘤生物力学. 优化条件提高了切割波速度 (SWS) 在体内测量的准确性.

科学领域:

  • 生物医学工程 生物医学工程
  • 医疗成像医学成像
  • 癌症研究 癌症研究

背景情况:

  • 组织生物力学特性在临床前癌症研究中至关重要,反映了治疗反应.
  • 小瘤大小对临床前剪切波弹性图 (SWE) 测量构成挑战.
  • 评估瘤的粘弹性特性需要精确的测量技术.

研究的目的:

  • 为了评估使用连续波振动的3D剪切波速度 (SWS) 测量的可重复性.
  • 在体内临床前瘤模型中研究不同条件 (频率,定向,麻醉) 对SWS重复性的影响.
  • 为了确定SWE在体内临床前瘤分析的可行性.

主要方法:

  • 在无血性裸体小鼠中的皮下MDA-MB-231瘤使用研究超声波扫描仪与18MHz线性探针进行成像.
  • 使用500,700和1000Hz的外部接触器诱导剪切波,从顶部和侧面方向进行测量.
  • 通过3D瘤体积注册和SWS数据的正常化交叉相关性分析,在三天内评估了重复性.

主要成果:

  • 在瘤和振动频率之间观察到平均SWS的显著差异 (p<0.001).
  • 平均SWS不受麻醉类型或瘤方向的影响.
  • 通过相同瘤,相同定向测量,特别是500Hz的侧向测量,改善了日复一日的SWS可重复性.
关键词:
在临床前的弹性图形.剪波成像仪使用剪波成像仪.超声波超声波是指超声波的使用.

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结论:

  • 连续振动的3D SWE是一种可重复和可行的技术,用于体内临床前研究.
  • 优化测量条件,如方向和频率,可以提高SWS数据的可重复性.
  • 这项研究验证了SWE作为一种有价值的工具,用于在临床前环境中表征瘤生物力学.