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Jin Liu; Jianhua Ma; Yi Zhang; Yang Chen; Jian Yang; Huazhong Shu; Limin Luo; Coatrieux, Gouenou; Wei Yang; Qianjin Feng; Wufan Chen
IEEE transactions on medical imaging, 12/2017, Letnik: 36, Številka: 12Journal Article
In low dose computed tomography (LDCT) imaging, the data inconsistency of measured noisy projections can significantly deteriorate reconstruction images. To deal with this problem, we propose here a new sinogram restoration approach, the sinogram- discriminative feature representation (S-DFR) method. Different from other sinogram restoration methods, the proposed method works through a 3-D representation-based feature decomposition of the projected attenuation component and the noise component using a well-designed composite dictionary containing atoms with discriminative features. This method can be easily implemented with good robustness in parameter setting. Its comparison to other competing methods through experiments on simulated and real data demonstrated that the S-DFR method offers a sound alternative in LDCT.
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