High Precision Carbon-Interspaced Antiscatter Grids: Performance Testing and Moiré Pattern Analysis
Recently, we have developed high precision carbon-interspaced antiscatter grids to be suitable for digital radiography (DR) adopting a precise sawing process. For systematic evaluation of the grid performance, we prepared several sample grids having different grid frequencies (4.08.5 lines/mm) and grid ratios (5:110:1) and established a well-controlled test condition based upon the IEC standard. In this paper, we presented the performance characteristics of the carbon-interspaced grids in terms of the transmission of primary radiation (Tp), the transmission of scattered radiation (Ts), the transmission of total radiation (Tt), contrast improvement factor (Cif), and Bucky factor (B). We also described the grid line artifact, known as a moiré pattern, which may be the most critical problem to be solved for the successful grid use in DR. We examined the factors that affect the moiré pattern by integrating the sample grids with an a-Se based flat panel detector having a 139µm×139 µm pixel size. © 2010 Elsevier B.V.
S. J. Lee and H. S. Cho and J. E. Oh and S. I. Choi and H. M. Cho and Y. O. Park and D. K. Hong and M. S. Lee and Y. J. Yang and U. K. Je and D. S. Kim and H. Lee, "High Precision Carbon-Interspaced Antiscatter Grids: Performance Testing and Moiré Pattern Analysis," Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, Jan 2011.
The definitive version is available at http://dx.doi.org/10.1016/j.nima.2010.08.084
Mining and Nuclear Engineering
Keywords and Phrases
Antiscatter Grids; Carbon Interspace; IEC Standard; Moiré Pattern
Article - Conference proceedings
© 2011 Elsevier, All rights reserved.