Determination of the detective quantum efficiency of a digital x-ray detector: comparison of three evaluations using a common image data set.

Journal Article

The detective quantum efficiency (DQE) of an x-ray digital imaging detector was determined independently by the three participants of this study, using the same data set consisting of edge and flat field images. The aim was to assess the possible variation in DQE originating from established, but slightly different, data processing methods used by different groups. For the case evaluated in this study differences in DQE of up to +/-15% compared to the mean were found. The differences could be traced back mainly to differences in the modulation transfer function (MTF) and noise power spectrum (NPS) determination. Of special importance is the inclusion of a possible low-frequency drop in MTF and the proper handling of signal offsets for the determination of the NPS. When accounting for these factors the deviation between the evaluations reduced to approximately +/-5%. It is expected that the recently published standard on DQE determination will further reduce variations in the data evaluation and thus in the results of DQE measurements.

Full Text

Duke Authors

Cited Authors

  • Neitzel, U; Günther-Kohfahl, S; Borasi, G; Samei, E

Published Date

  • August 2004

Published In

Volume / Issue

  • 31 / 8

Start / End Page

  • 2205 - 2211

PubMed ID

  • 15377085

International Standard Serial Number (ISSN)

  • 0094-2405

Digital Object Identifier (DOI)

  • 10.1118/1.1766421

Language

  • eng

Conference Location

  • United States