基于表面的与基于voxel的有限元头模型:对应变应变反应的比较分析
Zhou Zhou1, Xiaogai Li2, Svein Kleiven2
1Division of Neuronic Engineering, KTH Royal Institute of Technology, 14152, Stockholm, Sweden. zhouz@kth.se.
Biomechanics and modeling in mechanobiology
|March 11, 2025
概括
人类头部的有限元 (FE) 模型对于伤害评估至关重要. 这项研究发现,基于表面和voxel的FE头模型显示了类似的应变反应,尽管存在界面差异.
科学领域:
- 生物力学 生物力学
- 计算力学 计算力学 计算力学
- 神经科学是一个神经科学.
背景情况:
- 有限元 (FE) 模型对于人类头部伤害评估至关重要.
- 开发精确的六边形网状FE头模型,特别是捕捉复杂的大脑结构,仍然具有挑战性.
- 对于基于表面和基于voxel的FE头模型之间的应变反应相似性,人们的理解有限.
研究的目的:
- 为了比较基于相同成像数据的基于表面和基于voxel的FE头模型的应变反应.
- 为了研究网格光滑对应变应变差异的影响.
- 为了提供关于不同FE头模型网格技术之间的应变反应的一般相似性的定量见解.
主要方法:
- 从单个成像数据集中开发了三个解剖学详细的FE头部模型:一个基于表面的,具有符合网格的,两个基于voxel的 (带有和没有网格光滑).
- 在所有模型中确保相同的数值设置,仅在网格类型上有所不同.
- 模拟的头部冲击使用这三个模型来分析应变反应.
主要成果:
- 常见的损伤指标,如99百分点应变和大脑元素超过应变值的体积,在三个模型中显示出几乎相同的反应.
- 在表面模型和基于voxel的模型之间的界面边界 (例如皮质,,) 观察到显著的应变差异 (>0.1).
- 非接口区域表现出显著的菌株相似性.
- 与基于表面的模型相比,基于voxel的模型中的网格光滑稍微减少了应变差异.
结论:
- 基于表面和voxel的FE头部模型在评估常见伤害指标时显示出应变反应的一般相似性.
- 定量洞察证实了这些网格方法在头部撞击模拟中的可比性.
- 由于观察到的差异,建议在使用界面应变数据来预测损伤时谨慎使用.
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