Contrast-detail analysis of three flat panel detectors for digital radiography

Giovanni Borasi, Ehsan Samei, Marco Bertolini, Andrea Nitrosi, Davide Tassoni

Research output: Contribution to journalArticlepeer-review


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 predicted SNRT values corresponding to an observer efficiency of about 0.08 for systems A and B and 0.05 for system C.

Original languageEnglish
Pages (from-to)1707-1719
Number of pages13
JournalMedical Physics
Issue number6
Publication statusPublished - Jun 2006


  • Contrast detail
  • Diagnostic radiology
  • Digital imaging
  • Flat panel detectors
  • Image quality
  • Observer performance

ASJC Scopus subject areas

  • Biophysics


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