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用于模拟椎体成形术过程及其对癌症患者脊柱机械稳定性影响的数字孪生体。

A digital twin for simulating the vertebroplasty procedure and its impact on mechanical stability of vertebra in cancer patients.

机构信息

Department of Integrated Systems Engineering, The Ohio State University, Columbus, Ohio, USA.

Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA.

出版信息

Int J Numer Method Biomed Eng. 2022 Jun;38(6):e3600. doi: 10.1002/cnm.3600. Epub 2022 Apr 7.

Abstract

We present the application of ReconGAN, introduced in a previous study, for simulating the vertebroplasty (VP) operation and its impact on the fracture response of a vertebral body. ReconGAN consists of a Deep Convolutional Generative Adversarial Network (DCGAN) and a finite element based shape optimization algorithm to virtually reconstruct the trabecular bone microstructure. The VP procedure involves injecting shear-thinning liquid bone cement through a needle in the trabecular region to reinforce a diseased or fractured vertebra. To simulate this treatment modality, computational fluid dynamics (CFD) is employed to predict the morphology of the injected cement within the bone microstructure. A power-law equation is utilized to characterize the non-Newtonian shear-thinning behavior of the polymethyl methacrylate (PMMA) bone cement during injection simulations. The CFD model is coupled with the level-set method to simulate the motion of the interface separating bone cement and bone marrow. After predicting the cement morphology, a data co-registration algorithm is employed to transform the CFD model to a high-fidelity continuum damage mechanics (CDM) finite element model of the augmented vertebra for predicting the fracture response. A feasibility study is presented to demonstrate the ability of this CFD-CDM framework to investigate the effect of VP on the mechanical integrity of the vertebral body in a cancer patient with a lytic metastatic tumor.

摘要

我们介绍了先前研究中引入的 ReconGAN 在模拟经皮椎体成形术 (VP) 操作及其对椎体骨折反应的影响中的应用。ReconGAN 由一个深度卷积生成对抗网络 (DCGAN) 和一个基于有限元的形状优化算法组成,用于虚拟重建小梁骨的微观结构。VP 手术涉及通过针将剪切稀化的液态骨水泥注入小梁区域,以增强患病或骨折的椎体。为了模拟这种治疗方式,我们采用计算流体动力学 (CFD) 来预测骨微结构内注入水泥的形态。我们使用幂律方程来描述聚甲基丙烯酸甲酯 (PMMA) 骨水泥在注射模拟过程中的非牛顿剪切稀化行为。CFD 模型与水平集方法耦合,以模拟分离骨水泥和骨髓的界面的运动。在预测水泥形态后,我们采用数据配准算法将 CFD 模型转换为增强椎体的高保真连续损伤力学 (CDM) 有限元模型,以预测骨折反应。本文提出了一项可行性研究,以证明该 CFD-CDM 框架有能力研究 VP 对患有溶骨性转移性肿瘤的癌症患者椎体机械完整性的影响。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/441d/9287026/a764abccea26/CNM-38-0-g012.jpg

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