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Ring-artifacts removal for photon-counting CT.

Kang An, Jue Wang, Rifeng Zhou

    Optics Express
    |September 10, 2020
    PubMed
    Summary
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    This study introduces a fast method to remove ring artifacts in photon counting computed tomography (PCCT) images. The technique effectively suppresses artifacts using projection data, enhancing image quality without extra scans or computational cost.

    Area of Science:

    • Medical Imaging
    • Photon Counting Computed Tomography (PCCT)

    Background:

    • Ring artifacts are a common issue in PCCT images.
    • These artifacts degrade image quality and introduce non-uniformity bias.

    Purpose of the Study:

    • To develop a fast and effective method for removing ring artifacts in PCCT.
    • To improve the image quality of PCCT scans.

    Main Methods:

    • A novel ring artifact removal method was proposed.
    • The method utilizes correlations from projections across different views.
    • It employs the mean projection of the current scan for correction without additional scans.

    Main Results:

    • The method successfully corrected inconsistencies in all detector pixels simultaneously.

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  • It preserved reconstructed image details effectively.
  • Both numerical and preclinical experiments showed superior artifact suppression compared to existing methods.

    • Conclusions:

    • The proposed method offers a fast and efficient solution for ring artifact removal in PCCT.
    • It enhances image quality by suppressing artifacts without compromising image details or increasing computational load.