Approximate inverse and Sobolev estimates for the attenuated Radon transform
Approximate inverse and Sobolev estimates for the attenuated Radon transform
复制标题
衰减 Radon 变换的近似逆估计和 Sobolev 估计
DOI:
10.1088/0266-5611/31/10/105010
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发表时间:
2015
期刊:
影响因子:
2.1
通讯作者:
Lakhal
中科院分区:
文献类型:
--
作者:
Rigaud;Lakhal
The ill-posedness of the attenuated Radon transform is a challenging issue in practice due to the Poisson noise and the high level of attenuation. The investigation of the smoothing properties of the underlying operator is essential for developing a stable inversion. In this paper, we consider the framework of Sobolev spaces and derive analytically a reconstruction algorithm based on the method of the approximate inverse. The derived method inherits the efficiency and stability of the approximate inverse and supplies a method of extraction of contours. These algorithms appear to be efficient for an attenuation of human body type. However, for higher attenuations the ill-posedness increases exponentially what deteriorates accordingly the quality of reconstructions. Nevertheless, a high attenuation map affects less the contour extraction of a high contrast function and so can be neglected. This leads to simplifying the proposed method and circumvents in this case the artifacts due to the attenuation as attested by simulation results.
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影响因子:
2.1
作者:
A. Louis
通讯作者:
A. Louis
影响因子:
2
作者:
A. Katsevich
通讯作者:
A. Katsevich
DOI:
10.2172/943972
发表时间:
2008
期刊:
Lawrence Berkeley National Laboratory
影响因子:
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作者:
Qiu Huang;Q. Peng;Bin Huang;A. Cheryauka;G. Gullberg
通讯作者:
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作者:
E. Miqueles;A. R. Pierro
通讯作者:
A. R. Pierro
DOI:
10.1007/bf02922067
发表时间:
2004
期刊:
The Journal of Geometric Analysis
影响因子:
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作者:
Jan Boman;J. Strömberg
通讯作者:
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