Derivative-Hilbert-Backprojection based image reconstruction from truncated projections in helical cone-beam CT

被引:0
|
作者
Zhang Feng [1 ]
Yan Bin [1 ]
Li Lei [1 ]
Xi Xiao-Qi [1 ]
Jiang Hua [1 ]
Wei Xing [1 ]
Zhang Xiang [1 ]
Cui Jin-Xian [1 ]
机构
[1] Natl Digital Switching Syst Engn Technol Res Ctr, Zhengzhou 450002, Peoples R China
基金
国家高技术研究发展计划(863计划);
关键词
Helical cone-beam CT; Image reconstruction; Truncation artifacts; Derivative-Hilbert-Backprojection; COMPUTED-TOMOGRAPHY; INTERIOR TOMOGRAPHY; ALGORITHM;
D O I
10.13538/j.1001-8042/nst.26.20401
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
In helical cone-beam computed tomography (CT), Feldkamp-Davis-Kress (FDK) based image reconstruction algorithms are by far the most popular. However, artifacts are commonly met in the presence of lateral projection truncation. The reason is that the ramp filter is global. To restrain the truncation artifacts, an approximate reconstruction formula is proposed based on the Derivative-Hilbert-Backprojection (DHB) framework. In the method, the first order derivative filter is followed by the Hilbert transform. Since the filtered projection values are almost zero by the first order derivative filter, the following Hilbert transform has little influence on the projection values, even though the projections are laterally truncated. The proposed method has two main advantages. First, it has comparable computational efficiency and image quality as well as the conventional helical FDK algorithm for non-truncated projections. The second advantage is that images can be reconstructed with acceptable quality and much lower computational cost in comparison to the Laplace operator based algorithm in cases with truncated projections. To point out the advantages of our method, simulations on the computer and real data experiments on our laboratory industrial cone-beam CT are conducted. The simulated and experimental results demonstrate that the method is feasible for image reconstruction in the case of projection truncation.
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页数:9
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