Tomographic Inverse Problem with Estimating Missing Projections
Tomographic Inverse Problem with Estimating Missing Projections
复制标题
估计缺失投影的层析反演问题
DOI:
10.1155/2019/7932318
复制
发表时间:
2019
影响因子:
--
通讯作者:
Yoshinaga Tetsuya
中科院分区:
文献类型:
--
作者:
Kimura Masashi;Yamaguchi Yusaku;Abou Al-Ola Omar M.;Yoshinaga Tetsuya
Image reconstruction in computed tomography can be treated as an inverse problem, namely, obtaining pixel values of a tomographic image from measured projections. However, a seriously degraded image with artifacts is produced when a certain part of the projections is inaccurate or missing. A novel method for simultaneously obtaining a reconstructed image and an estimated projection by solving an initial‐value problem of differential equations is proposed. A system of differential equations is constructed on the basis of optimizing a cost function of unknown variables for an image and a projection. Three systems described by nonlinear differential equations are constructed, and the stability of a set of equilibria corresponding to an optimized solution for each system is proved by using the Lyapunov stability theorem. To validate the theoretical result given by the proposed method, metal artifact reduction was numerically performed.
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期刊:
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通讯作者:
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影响因子:
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