Browse > Article

Grid Angle Optimization and Grid Artifact Reduction in Digital Radiography Images Based on the Modulation Model  

Kim, Dong-Sik (Department of Electronics Engineering, Hankuk University of Foreign Studies)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.48, no.3, 2011 , pp. 30-41 More about this Journal
Abstract
In order to obtain more clear x-ray images, an antiscatter grid, which can absorb the scattered rays, is employed. In the high-resolution direct digital radiography, however, the artifacts due to the grid are visible. In this paper, within the methods of obtaining x-ray digital images by employing the rotated grids for the facility of grid artifact reduction, the previous work, where the frequencies of the artifact components on the boundary, is further analyzed and extended, and a min-max optimization for a given grid density is proposed. For practical grid densities, appropriate grid angles are provided and a grid artifact reduction algorithm is proposed for the appropriate grid angles. The proposed algorithm is tested for real x-ray digital images with a comparison, and can remove the grid artifacts while maintaining the resolution of the original image.
Keywords
digital radiography; grid artifacts; rotated grid;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 J. G. Proakis and D. G. Manolakis, Digital Signal Processing, 4th ed., NJ: Prentice Hall, 1007.
2 D. S. Kim, "Modulation model for the analysis of the stationary grid artifacts in digital radiography imaging," in Proc. IEEE Int. Symposium, Biomedical Imaging, Rotterdam, Netherlands, April 2010, pp. 768-771.
3 L. L. Barski and X. Wang, "Characterization, detection and suppression of stationary grids in digital projection radiography imagery," in Proc. SPIE Medical Imaging, pp.502-519, 1999.
4 I. N. Belykh and C. W. Cornelius, "Antiscatter stationary grid artifacts automated detection and removal in projection radiography images," in Proc. SPIE Medical Imaging, pp.1162-1166, 2001.
5 R. Sasada, M. Yamada, S. Hara, and H. Takeo, "Stationary grid pattern removal using 2-dimensional technique for Moire-free radiographic image display," in Proc. SPIE Medical Imaging, 2003.
6 M. A. Thomas, A. H. Rowberg, S. G. Langer, Y. Kim, "Iterative image enhancement of CR and DR images," Jour. Digital Imaging, vol. 17, no. 3, pp. 189-195, Sep. 2004.   DOI   ScienceOn
7 J. Wang and H. K. Huang, "Film digitization aliasing artifacts caused by grid line patterns," IEEE Trans. Medical Imaging, vol. 13, no. 2, June 1994.
8 R. C. Gonzalez and R. E. Woods, Digital Image Processing. 2nd. ed. NY: Prentice Hall, 2002.
9 C. -Y. Lin, W. -J. Lee, S. -J. Chen, C. -H. Tsai, J. -H. Lee, C. -H, Chang, and Y. -T. Ching, "A study of grid artifacts formation and elimination in computed radiographic images," Jour. Digital Imaging, vol. 19, no. 4, pp. 351-361, Dec. 2006.   DOI   ScienceOn
10 김동식, "고정그리드를 사용한 디지털 방사선 영상에서 1차원 필터에 기초한 왜곡의 제거," 대한전자공학회 논문집, 제 47권 SP편, 제 5호, 2010년 9월.
11 D. S. Kim and S. Lee, "Grid artifact reduction in radiography with arctan(1/2)-degree rotated grid," IEEE Int. Conf. Image Processing, Sep. 2010, pp. 1957-1960.