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SU‐GG‐I‐47: A New Limited‐Angle CT Reconstruction Method Based On Total‐Variation Minimization

Publication ,  Conference
Zhang, J; Ren, L; Zhou, S; Yin, F
Published in: Medical Physics
January 1, 2008

Purpose: To develop a new CT reconstruction algorithm based on Total‐Variation (TV) minimization. The new algorithm is specifically designed for limited angle reconstruction to alleviate volume information loss caused by incomplete projections. Method and Materials: TV is defined as the summation of the gradients between adjacent pixels. A nonlinear conjugate gradient algorithm is used to minimize TV and projection error simultaneously. Pixel Signal‐to‐Noise Ratio (PSNR) was used to quantitatively evaluate reconstruction quality of a Shepp‐Logan phantom. Head and neck CT images were reconstructed from simulated projections to demonstrate reconstruction quality at different scan angle. The effects of weighting factors for TV and projection frequency were investigated. Results: The algorithm can reconstruct good quality images with the scan angle as low as 60 degree. With 90‐degree projections, the reconstructed Shepp‐Logan phantom has a high PSNR of 17 dB. Weighting factors for TV were determined through simulations. Image qualities were improved by weighting more high frequency of the projection data. In simulation tests using head/neck simulated projections, volume information can be recovered accurately from 60‐degree projections. Conclusion: The TV‐based reconstruction algorithm improves the quality of limited angle CT reconstruction. Research sponsored by a Varian research grant. © 2008, American Association of Physicists in Medicine. All rights reserved.

Duke Scholars

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2008

Volume

35

Issue

6

Start / End Page

2653

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
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ICMJE
MLA
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Zhang, J., Ren, L., Zhou, S., & Yin, F. (2008). SU‐GG‐I‐47: A New Limited‐Angle CT Reconstruction Method Based On Total‐Variation Minimization. In Medical Physics (Vol. 35, p. 2653). https://doi.org/10.1118/1.2961445
Zhang, J., L. Ren, S. Zhou, and F. Yin. “SU‐GG‐I‐47: A New Limited‐Angle CT Reconstruction Method Based On Total‐Variation Minimization.” In Medical Physics, 35:2653, 2008. https://doi.org/10.1118/1.2961445.
Zhang, J., et al. “SU‐GG‐I‐47: A New Limited‐Angle CT Reconstruction Method Based On Total‐Variation Minimization.” Medical Physics, vol. 35, no. 6, 2008, p. 2653. Scopus, doi:10.1118/1.2961445.

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2008

Volume

35

Issue

6

Start / End Page

2653

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences