Papers Published

1. Borasi, G; Samei, E; Bertolini, M; Nitrosi, A; Tassoni, D, Contrast-detail analysis of three flat panel detectors for digital radiography., Med Phys, vol. 33 no. 6 (June, 2006), pp. 1707-1719 [16872078], [doi] .
   (last updated on 2025/04/05)

   Abstract:
   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.

   Keywords:
   Contrast Media • Humans • Models, Statistical • Neoplasms • Phantoms, Imaging • Radiographic Image Enhancement • Relative Biological Effectiveness • X-Ray Intensifying Screens* • analysis* • diagnosis* • instrumentation • methods* • pathology • radiography*