Evaluation of the Red Emitting ${\rm Gd}_{2}{\rm O}_{2}{\rm S}\!\!:\!\!{\rm Eu}$ Powder Scintillator for Use in Indirect X-Ray Digital Mammography Detectors
作者： C. M. Michail , G. P. Fountos , I. G. Valais , N. I. Kalyvas , P. F. Liaparinos
关键词: Light scattering 、 Optical transfer function 、 Optics 、 Detective quantum efficiency 、 Attenuation 、 Scintillator 、 Digital imaging 、 Luminescence 、 Digital mammography 、 Optoelectronics 、 Physics
摘要: The aim of the present study was to investigate imaging transfer characteristics and luminescence efficiency (XLE) Gd2O2S:Eu powder scintillator for use in X-ray mammography detectors. emits red part visible spectrum, having very good spectral compatibility with optical sensors employed digital systems. Three scintillating screens, coating thicknesses 33.1, 46.4 63.1 mg/cm2 , were prepared our laboratory. performance these screens assessed by experimental determination modulation function (MTF), noise (NTF) detective quantum (DQE) as well a single index image quality parameter such information capacity (IC). A theoretical model, describing radiation light transfer, used fit MTF data. This has allowed estimation attenuation coefficients scintillator. In addition, previously validated Monte Carlo code, based on properties Mie scattering theory, estimate detection efficiency, Swank factor zero frequency DQE Results showed that exhibits high values, which are comparable those commercially Gd2O2S:Tb screen. addition shows (effective gain) CCDs recently introduced CMOS Considering parameters results, this material can potentially be considered
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