基于多脊椎CT的有限元模型可以准确预测菌株吗? 一个体外验证研究
Alessandra Aldieri1, Chiara Garavelli2, Luca Patruno3
1PolitoBIOMedLab, Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Torino, Italy.
概括
脊椎的有限元素 (FE) 模型需要更好的椎间盘材料特性. 目前基于CT的模型准确地预测了脊椎位移,但与磁盘应变作斗争,需要新的建模方法来提高准确性.
科学领域:
- 生物力学 生物力学
- 计算建模计算建模
- 脊柱研究研究 脊柱研究
背景情况:
- 目前用于脊椎骨折风险的有限元素 (FE) 模型通常分析单个脊椎,忽视了脊椎间盘在负载分配中的作用.
- 将脊椎间盘纳入多脊椎FE模型可以实现更现实的边界条件.
- 计算机断层扫描 (CT) 扫描提供了脊椎材料属性,但缺乏磁盘信息.
研究的目的:
- 仅使用CT数据开发脊椎的多级FE模型.
- 通过将预测的移位和应变与实验测量进行比较来验证这些模型.
- 评估不同椎间盘材料特性对模型准确性的影响.
主要方法:
- 人类T10-L1脊柱段在曲-压缩中进行了测试.
- 数字图像相关性测量了测试期间的表面位移和应变.
- 创建了一个基于CT的FE模型,将基于HU的属性分配给脊椎,并将各种超弹性属性分配给磁盘组件 (核脉,纤维结节).
主要成果:
- 该FE模型准确地预测了脊椎表面位移 (R2 = 0.92-0.99).
- 然而,不同的磁盘构成定律导致与实验数据相比,预测的主要菌株分布存在显著差异 (平均相对误差超过34%).
结论:
- 基于CT的多层次FE模型可以准确预测脊椎位移.
- 目前在这些模型中建模椎间盘材料属性的方法不足以准确预测应变.
- 对椎间盘进行修订的建模策略对于提高基于CT的多级FE模型的准确性至关重要.
更多相关视频
08:04Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis
Published on: March 11, 2017
9.4K
09:34A Method to Estimate Cadaveric Femur Cortical Strains During Fracture Testing Using Digital Image Correlation
Published on: September 14, 2017
7.5K
相关概念视频
01:20Normal Strain under Axial Loading
656
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
656
01:14Bending of Curved Members - Strain Analysis
209
The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
The important part of bending analysis for such a member...
The important part of bending analysis for such a member...
209