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    Journals >Acta Optica Sinica >Volume 40 >Issue 22 >Page 2210001 > Article
    • Acta Optica Sinica
    • Vol. 40, Issue 22, 2210001 (2020)
    Improved Image Artifacts Suppression Method for Neutron External CT
    Qiang Lin1, Min Yang1、*, Xiaomin Zhang1, Bin Tang2, Bin Liu2, and Heyong Huo2
    Author Affiliations
  • 1School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • 2Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China
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    DOI: 10.3788/AOS202040.2210001 Cite this Article Set citation alerts
    Qiang Lin, Min Yang, Xiaomin Zhang, Bin Tang, Bin Liu, Heyong Huo. Improved Image Artifacts Suppression Method for Neutron External CT[J]. Acta Optica Sinica, 2020, 40(22): 2210001 Copy Citation Text show less
    Schematic of neutron exterior CT scan
    Fig. 1. Schematic of neutron exterior CT scan
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    Schematic of external CT scan phantom. (a) Phantom; (b) scanning process; (c) sinusoidal image
    Fig. 2. Schematic of external CT scan phantom. (a) Phantom; (b) scanning process; (c) sinusoidal image
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    Images reconstructed by different algorithms. (a) FBP algorithm; (b) SART algorithm
    Fig. 3. Images reconstructed by different algorithms. (a) FBP algorithm; (b) SART algorithm
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    Calculation method of local directional difference [23]. (a) Coordinate system of local directional difference; (b) calculation method of local directional difference
    Fig. 4. Calculation method of local directional difference [23]. (a) Coordinate system of local directional difference; (b) calculation method of local directional difference
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    Calculation method of local directional difference in improved method. (a) Coordinate system of local directional difference; (b) calculation method of local directional difference
    Fig. 5. Calculation method of local directional difference in improved method. (a) Coordinate system of local directional difference; (b) calculation method of local directional difference
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    Reconstruction results of different algorithms. (a) SART algorithm; (b) SART-TV algorithm; (c) SART-WDTV algorithm
    Fig. 6. Reconstruction results of different algorithms. (a) SART algorithm; (b) SART-TV algorithm; (c) SART-WDTV algorithm
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    Comparison of reconstruction results of different algorithms. (a) SART-WDTV algorithm; (b) improved SART-WDTV algorithm
    Fig. 7. Comparison of reconstruction results of different algorithms. (a) SART-WDTV algorithm; (b) improved SART-WDTV algorithm
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    Complete projected sinogram and reconstructed image of gear sample. (a) Complete projected sinogram; (b) reconstructed image
    Fig. 8. Complete projected sinogram and reconstructed image of gear sample. (a) Complete projected sinogram; (b) reconstructed image
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    Reconstruction images of gear sample by different algorithms. (a) Sinogram after symmetrical complement data; (b) FBP algorithm; (c) sinogram obtained by exterior CT scan; (d) SART algorithm
    Fig. 9. Reconstruction images of gear sample by different algorithms. (a) Sinogram after symmetrical complement data; (b) FBP algorithm; (c) sinogram obtained by exterior CT scan; (d) SART algorithm
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    Gear sample reconstruction image with different algorithms. (a) SART-TV algorithm; (b) SART-WDTV algorithm; (c) improved SART-WDTV algorithm
    Fig. 10. Gear sample reconstruction image with different algorithms. (a) SART-TV algorithm; (b) SART-WDTV algorithm; (c) improved SART-WDTV algorithm
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    Local magnification results of reconstructed images with different algorithms. (a) Complete data reconstruction; (b) SART-TV algorithm; (c) SART-WDTV algorithm; (d) improved SART-WDTV algorithm
    Fig. 11. Local magnification results of reconstructed images with different algorithms. (a) Complete data reconstruction; (b) SART-TV algorithm; (c) SART-WDTV algorithm; (d) improved SART-WDTV algorithm
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    RMSE curves obtained by different reconstruction algorithms
    Fig. 12. RMSE curves obtained by different reconstruction algorithms
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    Scanning modeUnit size of detector /pixelDetector width /pixelScanning angular range /(°)Number of projected viewsPhantom size /(pixel×pixel)
    2D parallel beam11280-360720512×512
    Table 1. Parameters of external CT scan phantom
    AlgorithmMSEPSNR
    SART1319.47616.927
    SART-TV1034.75617.982
    SART-WDTV874.63018.713
    Improved SART-WDTV828.18918.950
    Table 2. MSE and PSNR of images reconstructed by different algorithms
    Abstract
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    Qiang Lin, Min Yang, Xiaomin Zhang, Bin Tang, Bin Liu, Heyong Huo. Improved Image Artifacts Suppression Method for Neutron External CT[J]. Acta Optica Sinica, 2020, 40(22): 2210001
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