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Acta Optica Sinica, Volume. 39, Issue 8, 0834001(2019)

Scatter Correction Based on Beam Stop Array for Cone-Beam Micro-Computed Tomography

Tianxu Tang1,2, Xiaojiao Duan1,2、*, Zhizheng Zhou3, and Qi Wu4
Author Affiliations
  • 1 Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, Chongqing University, Chongqing 400044, China;
  • 2 Engineering Research Center of Industrial Computed Tomography Nondestructive Testing, Ministry of Education, Chongqing University, Chongqing 400044, China
  • 3 Chongqing Zhence Science and Technology Co., Ltd., Chongqing 401332, China
  • 4 AVIC Chengdu Aircraft Industrial (Group) Co., Ltd., Chengdu, Sichuan 610091, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (18)
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    References (25)
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    Figures & Tables(18)
    Schematic of scanning

    Fig. 1. Schematic of scanning

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    Principles of BSA scatter correction. (a) Scan 1; (b) scan 2

    Fig. 2. Principles of BSA scatter correction. (a) Scan 1; (b) scan 2

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    Flow chart of scatter correction process based on BSA

    Fig. 3. Flow chart of scatter correction process based on BSA

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    Appearance and internal structures of micro-CT system. (a) Appearance; (b) internal structure

    Fig. 4. Appearance and internal structures of micro-CT system. (a) Appearance; (b) internal structure

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    Correction plate and true sample. (a) Correction plate; (b) true sample

    Fig. 5. Correction plate and true sample. (a) Correction plate; (b) true sample

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    Schematic of each area of correction plate

    Fig. 6. Schematic of each area of correction plate

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    Flow chart of correction program

    Fig. 7. Flow chart of correction program

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    Interface of reconstruction software CDVAS 4.0

    Fig. 8. Interface of reconstruction software CDVAS 4.0

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    DR projection images and gray contrast before and after correction, and percentage of scatter signal to original signal. (a) DR projection image before correction; (b) DR projection image after correction; (c) gray before and after correction; (d) percentage of scatter signal to original signal

    Fig. 9. DR projection images and gray contrast before and after correction, and percentage of scatter signal to original signal. (a) DR projection image before correction; (b) DR projection image after correction; (c) gray before and after correction; (d) percentage of scatter signal to original signal

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    Slice images and linear gray contrast before and after correction. (a) Slice image before correction; (b) slice image after correction; (c) linear gray contrast

    Fig. 10. Slice images and linear gray contrast before and after correction. (a) Slice image before correction; (b) slice image after correction; (c) linear gray contrast

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    Slice images before and after correction. (a) Before correction; (b) after correction

    Fig. 11. Slice images before and after correction. (a) Before correction; (b) after correction

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    Three-dimensional reconstruction images of scatter signals and distributions of scatter proportion. (a) Three-dimensional reconstruction image of scatter signals; (b) front of true sample corresponding to scatter signals; (c) distributions of scatter proportion

    Fig. 12. Three-dimensional reconstruction images of scatter signals and distributions of scatter proportion. (a) Three-dimensional reconstruction image of scatter signals; (b) front of true sample corresponding to scatter signals; (c) distributions of scatter proportion

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    Contrast of three-dimensional construction images. (a) Three-dimensional construction image before scatter correction; (b) three-dimensional construction image after BSA scatter correction; (c) three-dimensional reconstruction image after BSA scatter correction in combination with beam-hardening correction

    Fig. 13. Contrast of three-dimensional construction images. (a) Three-dimensional construction image before scatter correction; (b) three-dimensional construction image after BSA scatter correction; (c) three-dimensional reconstruction image after BSA scatter correction in combination with beam-hardening correction

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    Roundness analysis results of scatter correction in combination with focus-drift correction. (a) Projection image; (b) site of slice; (c) slice image; (d) without correction; (e) focus-drift correction; (f) scatter correction; (g) scatter correction in combination with focus-drift correction

    Fig. 14. Roundness analysis results of scatter correction in combination with focus-drift correction. (a) Projection image; (b) site of slice; (c) slice image; (d) without correction; (e) focus-drift correction; (f) scatter correction; (g) scatter correction in combination with focus-drift correction

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    Stability calibration of correction plate. (a) With drift; (b) without drift

    Fig. 15. Stability calibration of correction plate. (a) With drift; (b) without drift

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    Stability calibration of sample

    Fig. 16. Stability calibration of sample

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    • Table 1. Main scanning and reconstruction parameters of micro-CT system

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      Table 1. Main scanning and reconstruction parameters of micro-CT system

      ParameterValue
      Scan voltage /kV120
      Scan current /μA200
      Focus size /μm10
      Total indexing500
      Frame number in one indexing3
      Projection image size /(pixel×pixel)1024×1024
      Reconstruction image size /(pixel×pixel)800×800
      X-ray source-to-rotating distance /mm416.9
      X-ray source-to-detector distance /mm1125.9

    • Table 2. CNR of slice images before and after correction

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      Table 2. CNR of slice images before and after correction

      CNRArea aArea b
      Without scatter correction12.0313.57
      With scatter correction15.4616.47
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    Tianxu Tang, Xiaojiao Duan, Zhizheng Zhou, Qi Wu. Scatter Correction Based on Beam Stop Array for Cone-Beam Micro-Computed Tomography[J]. Acta Optica Sinica, 2019, 39(8): 0834001

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    Paper Information

    Category: X-Ray Optics

    Received: Feb. 15, 2019

    Accepted: Apr. 11, 2019

    Published Online: Aug. 7, 2019

    The Author Email: Duan Xiaojiao (duan721@163.com)

    DOI:10.3788/AOS201939.0834001

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology