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基于定量计算机断层扫描的有限元分析的扫描分辨率和元素大小对牛椎体力学参数的影响。

Effects of Scan Resolutions and Element Sizes on Bovine Vertebral Mechanical Parameters from Quantitative Computed Tomography-Based Finite Element Analysis.

机构信息

Department of Engineering Mechanics, Nanling Campus, Jilin University, Changchun 130025, China.

Department of Radiology, The First Hospital of Jilin University, Changchun 130021, China.

出版信息

J Healthc Eng. 2017;2017:5707568. doi: 10.1155/2017/5707568. Epub 2017 Jun 1.

DOI:10.1155/2017/5707568
PMID:29065624
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5474284/
Abstract

Quantitative computed tomography-based finite element analysis (QCT/FEA) has been developed to predict vertebral strength. However, QCT/FEA models may be different with scan resolutions and element sizes. The aim of this study was to explore the effects of scan resolutions and element sizes on QCT/FEA outcomes. Nine bovine vertebral bodies were scanned using the clinical CT scanner and reconstructed from datasets with the two-slice thickness, that is, 0.6 mm (PA resolution) and 1 mm (PB resolution). There were significantly linear correlations between the predicted and measured principal strains ( > 0.7, < 0.0001), and the predicted vertebral strength and stiffness were modestly correlated with the experimental values ( > 0.6, < 0.05). Two different resolutions and six different element sizes were combined in pairs, and finite element (FE) models of bovine vertebral cancellous bones in the 12 cases were obtained. It showed that the mechanical parameters of FE models with the PB resolution were similar to those with the PA resolution. The computational accuracy of FE models with the element sizes of 0.41 × 0.41 × 0.6 mm and 0.41 × 0.41 × 1 mm was higher by comparing the apparent elastic modulus and yield strength. Therefore, scan resolution and element size should be chosen optimally to improve the accuracy of QCT/FEA.

摘要

基于定量计算机断层扫描的有限元分析（QCT/FEA）已经被开发出来用于预测椎体强度。然而，QCT/FEA 模型可能会因扫描分辨率和单元大小而有所不同。本研究旨在探讨扫描分辨率和单元大小对 QCT/FEA 结果的影响。使用临床 CT 扫描仪对 9 个牛椎体进行扫描，并从数据集重建，数据集的厚度为 2 层，即 0.6mm（PA 分辨率）和 1mm（PB 分辨率）。预测的和测量的主应变之间存在显著的线性相关性（ > 0.7， < 0.0001），预测的椎体强度和刚度与实验值呈中度相关（ > 0.6， < 0.05）。两种不同的分辨率和六种不同的单元大小组合成对，获得了 12 例牛松质骨的有限元（FE）模型。结果表明，PB 分辨率的 FE 模型的力学参数与 PA 分辨率的 FE 模型相似。通过比较表观弹性模量和屈服强度，单元大小为 0.41×0.41×0.6mm 和 0.41×0.41×1mm 的 FE 模型的计算精度更高。因此，为了提高 QCT/FEA 的准确性，应选择最佳的扫描分辨率和单元大小。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/5f88d390db94/JHE2017-5707568.008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/a0c7c14f3edc/JHE2017-5707568.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/bb3a3a9dcc25/JHE2017-5707568.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/e6e2469360bc/JHE2017-5707568.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/de93d6e94ca7/JHE2017-5707568.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/9774ad78bd27/JHE2017-5707568.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/826bcb06d28f/JHE2017-5707568.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/a1bd74b094ce/JHE2017-5707568.007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/5f88d390db94/JHE2017-5707568.008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/a0c7c14f3edc/JHE2017-5707568.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/bb3a3a9dcc25/JHE2017-5707568.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/e6e2469360bc/JHE2017-5707568.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/de93d6e94ca7/JHE2017-5707568.004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/9774ad78bd27/JHE2017-5707568.005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/826bcb06d28f/JHE2017-5707568.006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/a1bd74b094ce/JHE2017-5707568.007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/43e7/5474284/5f88d390db94/JHE2017-5707568.008.jpg

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