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A Study of Grid Artifacts Formation and Elimination in Computed Radiographic Images

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Computed radiography (CR) has many advantages such as filmless operations, efficiency, and convenience. Furthermore, it is easier to integrate with the picture archiving and communication systems. Another important advantage is that CR images generally have a wider dynamic range than conventional screen film. Unfortunately, grid artifacts and moiré pattern artifacts may be present in CR images. These artifacts become a more serious problem when viewing CR images on a computer monitor when a clinic grade monitor is not available. Images produced using a grid with higher frequency or a Potter–Bucky grid (i.e., a moving grid, Bucky for short) can reduce occurrence but cannot guarantee elimination of these artifacts [CR & PACS (2000); Detrick F (2001), pp 7–8]. In this paper, the formation of the artifacts is studied. We show that the grid artifacts occur in a narrow band of frequency in the frequency domain. The frequency can be determined, accurately located, and thus removed from the frequency domain. When comparing the results obtained from the proposed method against the results obtained using previous computer methods, we show that our method can achieve better image quality.

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Acknowledgments

This work was supported under the grants NSC-90-2213-E-009-119, National Science Council, Taiwan, and 91-S009 from the National Taiwan University Hospital, Taipei, Taiwan.

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Authors and Affiliations

  1. Department of Computer and Information Science, National Chiao Tung University, 1001 University Rd., Hsin Chu, Taiwan, Republic of China

    Chih-Yang Lin, Jei-Han Lee & Yu-Tai Ching

  2. Department of Medical Imaging, National Taiwan University Hospital, Taipei, Taiwan, Republic of China

    Wen-Jeng Lee, Shyh-Jye Chen, Ching-Hwa Tsai & Chia-Hung Chang

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  1. Chih-Yang Lin
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  2. Wen-Jeng Lee
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  3. Shyh-Jye Chen
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  4. Ching-Hwa Tsai
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  5. Jei-Han Lee
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Correspondence to Yu-Tai Ching.

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Lin, CY., Lee, WJ., Chen, SJ. et al. A Study of Grid Artifacts Formation and Elimination in Computed Radiographic Images. J Digit Imaging 19, 351–361 (2006). https://doi.org/10.1007/s10278-006-0630-8

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