標題: A study of grid artifacts formation and elimination in computed radiographic images
作者: Lin, Chih-Yang
Lee, Wen-Jeng
Chen, Shyh-Jye
Tsai, Ching-Hwa
Lee, Jei-Han
Chang, Chia-Hung
Ching, Yu-Tai
資訊工程學系
Department of Computer Science
關鍵字: Moire;aliasing;computed radiography;grid;Bucky
公開日期: 1-十二月-2006
摘要: 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 moire 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.
URI: http://dx.doi.org/10.1007/s10278-006-0630-8
http://hdl.handle.net/11536/11488
ISSN: 0897-1889
DOI: 10.1007/s10278-006-0630-8
期刊: JOURNAL OF DIGITAL IMAGING
Volume: 19
Issue: 4
起始頁: 351
結束頁: 361
顯示於類別:期刊論文


文件中的檔案:

  1. 000242824200008.pdf