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Research on Direct 3D Electromagnetic Tomography Technique

机译：直接3D电磁断层扫描技术研究

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Electromagnetic tomography (EMT) is an emerging imaging modality which attempts to visualize the distribution of electrically conductive or magnetically permeable materials using measurements obtained from coils distributed around the vessels or pipelines. The traditional EMT research concerns about the two-dimensional (2D) cross-sectional imaging. However, hardly any three-dimensional (3D) information of the target objects can be obtained. Effective 3D EMT imaging technique can provide further axial information and intuitional images of the target objects, which is especially suitable for processes with significant change of conductivity distribution in the axial direction. The direct 3D EMT imaging technique, which uses measurements obtained from both the same layers and the different layers and can directly acquire the 3D reconstructed images, is studied in this paper including issues such as 3D sensor layout, measurement strategy, simulation research, 3D image reconstruction algorithm. The 3D EMT finite element simulation model is established to conduct the forward problem calculations and further verify the feasibility of the sensitivity matrix. In the simulation process, a three-plane cylindrical EMT sensor with 12 coils is designed to verify the feasibility and effectiveness of the direct 3D EMT imaging technique. The images are reconstructed by three image reconstruction algorithms including Tikhonov regularization method, Projected Landweber iterative algorithm and total variation regularization method. Compared with the other two algorithms, total variation regularization method is superior in terms of the eight typical patterns due to the fact that it possesses good edge-preserving property.
机译：电磁断层扫描（EMT）是一种新兴成像模型，其试图使用从分布在容器或管道周围的线圈获得的测量来可视化导电或磁性可渗透材料的分布。传统的EMT研究涉及二维（2D）横截面成像。然而，几乎可以获得目标对象的任何三维（3D）信息。有效的3D EMT成像技术可以提供目标物体的进一步轴向信息和直觉图像，其特别适用于具有轴向导电性分布的显着变化的过程。本文研究了使用从相同层和不同层获得的测量的直接3D EMT成像技术，并且可以直接获取3D重建图像，包括3D传感器布局，测量策略，仿真研究，3D图像等问题重建算法。建立3D EMT有限元仿真模型来进行前向问题计算，并进一步验证灵敏度矩阵的可行性。在仿真过程中，具有12个线圈的三平面圆柱形EMT传感器旨在验证直接3D EMT成像技术的可行性和有效性。图像由三个图像重建算法重建，包括Tikhonov正规化方法，投影的Landweber迭代算法和总变化正则化方法。与其他两种算法相比，由于它具有良好的边缘保存性能，总变化正规方法是八种典型模式的优越性。

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