3D Heterogeneous Stiffness Reconstruction Using MRI and the Virtual Fields Method
3D Heterogeneous Stiffness Reconstruction Using MRI and the Virtual Fields Method
复制标题
使用 MRI 和虚拟场方法进行 3D 异质刚度重建
DOI：
10.1007/s11340-008-9128-2
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发表时间：
2008
影响因子：
2.4
通讯作者：
D. Steele
中科院分区：
文献类型：
--
作者：
S. Avril;J. M. Huntley;F. Pierron;D. Steele
本文首次将虚场法推广到由三维大体积全场位移数据重建非均匀刚度特性。数据由磁共振成像（MRI）提供。讨论了两个主要问题：1.非均质固体中两种不同介质刚度比的识别; 2.非均质固体中刚度不均匀性的重建。该方法基于平衡方程的有限元离散化。它是测试与受激回波MRI技术的幻影上获得的实验全场数据。体模由埋在较低模量材料中的刚性球形夹杂物制成。初步的独立测试表明，夹杂物的材料比周围的材料硬四倍。该比值通过我们的方法直接在具有MRI数据的体模上正确识别。此外，模量分布是有前途的重建在整个调查的体积。然而，所得的模量分布是高度可变的。这可以通过以下事实来解释：该方法依赖于数据的二阶微分，这往往会放大噪声。通过使用适当的滤波算法，噪声显著降低。
The first extension of the virtual fields method to the reconstruction of heterogeneous stiffness properties from 3D bulk full-field displacement data is presented in this paper. Data are provided by Magnetic Resonance Imaging (MRI). Two main issues are addressed: 1. the identification of the stiffness ratio between two different media in a heterogeneous solid; 2. the reconstruction of stiffness heterogeneities buried in a heterogeneous solid. The approach is based on a finite element discretization of the equilibrium equations. It is tested on experimental full-field data obtained on a phantom with the stimulated echo MRI technique. The phantom is made of a stiff spherical inclusion buried within a lower modulus material. Preliminary independent tests showed that the material of the inclusion was four times stiffer than the surrounding material. This ratio value is correctly identified by our approach directly on the phantom with the MRI data. Moreover, the modulus distribution is promisingly reconstructed across the whole investigated volume. However, the resulting modulus distribution is highly variable. This is explained by the fact that the approach relies on a second order differentiation of the data, which tends to amplify noise. Noise is significantly reduced by using appropriate filtering algorithms.
影响因子：
2.9
作者：
Doyley, MM;Srinivasan, S;Ophir, J
通讯作者：
Ophir, J
影响因子：
1.8
作者：
Weaver, JB;Doyley, M;Paulsen, K
通讯作者：
Paulsen, K