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Limited-angle image reconstruction based on Mumford–Shah-like model and wavelet tight frames

  • Lingli Zhang
  • Li Zeng
  • Chengxiang Wang
  • Yumeng Guo
Research Article
  • 11 Downloads

Abstract

Restricted by the scanning environment and the radiation exposure of computed tomography (CT), the obtained projection data are sometimes incomplete, which results in an ill-posed problem, such as a limited-angle image reconstruction. In such circumstance, the commonly used analytic and iterative algorithms, such as filtered back-projection and simultaneous algebraic reconstruction technique (SART), will not work well. Nowadays, a popular iterative image reconstruction algorithm (\({\hbox {SART}}+{\hbox {TV}}\)) solving the optimization model based on the minimization of total variation (TV) of the image applies to the sparse-view reconstruction problem well; it is not effective on small limited-angle reconstruction problem, especially in aspect of suppressing slope artifacts when the limited-angle projection views are severely reduced. In this work, we develop a reconstruction model based on the Mumford–Shah-like model and wavelet tight frames that applies to limited-angle CT; and the corresponding iterative method is given. Numerical experiments and quantitative analysis demonstrate that our method outperforms SART and \({\hbox {SART}}+{\hbox {TV}}\) in suppressing slope artifacts when the limited-angle projection views are severely decreased.

Keywords

Computed tomography Image reconstruction Wavelet tight frames Mumford–Shah model 

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China (61271313, 61471070) and National Instrumentation Program of China (2013YQ030629).

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Copyright information

© The Optical Society of India 2018

Authors and Affiliations

  • Lingli Zhang
    • 1
    • 2
  • Li Zeng
    • 1
    • 2
  • Chengxiang Wang
    • 3
  • Yumeng Guo
    • 1
    • 2
  1. 1.College of Mathematics and StatisticsChongqing UniversityChongqingChina
  2. 2.Engineering Research Center of Industrial Computed Tomography Nondestructive Testing of the Education Ministry of ChinaChongqing UniversityChongqingChina
  3. 3.School of Mathematical SciencesUniversity of Electronic Science and Technology of ChinaChengduChina

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