Combination of Boundary Element Method and Finite Element Method in Diffuse Optical Tomography

Combination of Boundary Element Method and Finite Element Method in Diffuse Optical Tomography
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漫射光学层析成像中边界元法与有限元法的结合

DOI:
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发表时间:
2010
影响因子:
4.6
通讯作者:
S. Arridge
S. Arridge
中科院分区:
工程技术2区
文献类型:
--
作者:
Josias P. Elisee;A. Gibson;S. Arridge

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本文提出了一种新的光学层析成像数值方法:边界元/有限元组合法(BEM-FEM),旨在解决层状混浊介质中的重建问题。BEM-FEM通过创建体积网格并仅在该区域中重建来关注感兴趣区域。所有其它区域在表面积分方法中被视为分段常数。我们验证了模型在同心球,不同位置的体积积分治疗区,并发现它比较好的分析结果。然后,我们进行了功能成像的新生儿的运动皮层在体内,在重建仅限于大脑,无论是与FEM和BEM-FEM。这些结果显示了BEM-FEM在感兴趣的器官被浅表层包围的情况下的有效性。
This paper presents a new numerical method for optical tomography: the combined boundary element/finite element method (BEM-FEM), designed to tackle reconstructions in layered turbid media. The BEM-FEM focuses on the region of interest by creating a volume mesh and reconstructing in this region only. All other regions are treated as piecewise constant in a surface-integral approach. We validate the model in concentric spheres, with different positions of the volume-integral treated area and found it compared well with an analytical result. We then performed functional imaging of the neonate's motor cortex in vivo, in a reconstruction restricted to the brain, both with FEM and BEM-FEM. These results show the effectiveness of the BEM-FEM in situations where the organ of interest is surrounded by superficial layers.
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影响因子: 1.9
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