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Determination of the detective quantum efficiency of a digital x‐ray detector: Comparison of three evaluations using a common image data set
Author(s) -
Neitzel Ulrich,
GüntherKohfahl Susanne,
Borasi Giovanni,
Samei Ehsan
Publication year - 2004
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1766421
Subject(s) - detective quantum efficiency , optical transfer function , detector , digital radiography , data set , optics , x ray detector , noise (video) , standard deviation , image quality , physics , mathematics , statistics , computer science , artificial intelligence , radiography , image (mathematics) , nuclear physics
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.