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Evaluation of the generality and accuracy of a new mesh morphing procedure for the human femur

493003513 添加于 2014-3-12 09:01 | 922 次阅读 | 0 个评论

作者
Grassi L, Hraiech N, Schileo E, Ansaloni M, Rochette M, Viceconti M
摘要
Various papers described mesh morphing techniques for computational biomechanics, but none of them provided a quantitative assessment of generality, robustness, automation, and accuracy in predicting strains. This study aims to quantitatively evaluate the performance of a novel mesh-morphing algorithm. A mesh-morphing algorithm based on radial-basis functions and on manual selection of corresponding landmarks on template and target was developed. The periosteal geometries of 100 femurs were derived from a computed tomography scan database and used to test the algorithm generality in producing finite element (FE) morphed meshes. A published benchmark, consisting of eight femurs for which in vitro strain measurements and standard FE model strain prediction accuracy were available, was used to assess the accuracy of morphed FE models in predicting strains. Relevant parameters were identified to test the algorithm robustness to operative conditions. Time and effort needed were evaluated to define the algorithm degree of automation. Morphing was successful for 95% of the specimens, with mesh quality indicators comparable to those of standard FE meshes. Accuracy of the morphed meshes in predicting strains was good (R(2)>0.9, RMSE%0.05) and partially to the number of landmark used. Producing a morphed mesh starting from the triangularized geometry of the specimen requires on average 10 min. The proposed method is general, robust, automated, and accurate enough to be used in bone FE modelling from diagnostic data, and prospectively in applications such as statistical shape modelling.
详细资料
- 关键词: *Algorithms; Biomechanical Phenomena; *Computer Graphics; Databases, Factual; *Femur/anatomy & histology/radiography; Finite Element Analysis; Humans; Models, Anatomic; Reproducibility of Results; Stress, Mechanical; Tomography, X-Ray Computed
- 文献种类: Journal Article
- 期刊名称: Medical Engineering & Physics
- 期刊缩写: Med Eng Phys
- 期卷页: 2011年第33卷第1期 112-120页
- 地址: Laboratorio di Tecnologia Medica, Istituto Ortopedico Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy
- ISBN: 1350-4533
学科领域工程技术 » 机械工程
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