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Contrast‐detail analysis of three flat panel detectors for digital radiography
Author(s) -
Borasi Giovanni,
Samei Ehsan,
Bertolini Marco,
Nitrosi Andrea,
Tassoni Davide
Publication year - 2006
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 - 10.1118/1.2191014
Subject(s) - flat panel detector , imaging phantom , detector , contrast (vision) , digital radiography , radiography , image quality , flat panel , detective quantum efficiency , optics , nuclear medicine , radiation , computer science , mathematics , physics , computer vision , medicine , nuclear physics , image (mathematics)
In this paper we performed a contrast detail analysis of three commercially available flat panel detectors, two based on the indirect detection mechanism (GE Revolution XQ/i, system A, and Trixell/Philips Pixium 4600, system B) and one based on the direct detection mechanism (Hologic DirectRay DR 1000, system C). The experiment was conducted using standard x‐ray radiation quality and a widely used contrast‐detail phantom. Images were evaluated using a four alternative forced choice paradigm on a diagnostic‐quality softcopy monitor. At the low and intermediate exposures, systems A and B gave equivalent performances. At the high dose levels, system A performed better than system B in the entire range of target sizes, even though the pixel size of system A was about 40% larger than that of system B. At all the dose levels, the performances of the system C (direct system) were lower than those of system A and B (indirect systems). Theoretical analyses based on the Perception Statistical Model gave similar predictedSNR Tvalues corresponding to an observer efficiency of about 0.08 for systems A and B and 0.05 for system C.