A study of grid artifacts formation and elimination in computed radiographic images

Chih Yang Lin, Wen Jeng Lee, Shyh Jye Chen, Ching Hwa Tsai, Jei Han Lee, Chia Hung Chang, Yu-Tai Ching*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)351-361
Number of pages11
JournalJournal of Digital Imaging
Volume19
Issue number4
DOIs
StatePublished - 1 Dec 2006

Keywords

  • Aliasing
  • Bucky
  • Computed radiography
  • Grid
  • Moiré

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