Measurements of X-ray Imaging Performance of Granular Phosphors With Direct-Coupled CMOS Sensors

Experimental measurement of a high resolution CMOS detector coupled to CsI scintillators under X-ray radiation

“…The concept of image information capacity (IC) has been introduced within the context of Shannon's information theory, in order to assess image information content (Shannon, 1948;Jones, 1961Jones, , 1962Gregg, 1967;Kanamori, 1968;Dainty and Shaw, 1974;Maiorchuk et al, 1974;Brown et al, 1979;Shaw, 1979;Wagner et al, 1979;Evans, 1981;Kanamori and Matsuoto, 1984;Cavouras et al, 2000;Kandarakis et al, 2001aKandarakis et al, , 2001b. In digital imaging, the continuous spatial distribution of an optically generated image is sampled by the discrete sensitive pixels on a photodiode array, whose outputs are converted into digitized signals and stored in an image processing system for numerical evaluation.…”

“…The experimental method was based on the guidelines published by the International Electrotechnical Commission (IEC), which has standardized the methodology for digital detectors (IEC, 2005). In addition the results of the present work have been compared with the results of previously studied CMOS sensors, coupled to CsI:Tl and Gd 2 O 2 S:Tb phosphor screens (Cho et al, 2008;Michail et al, 2011a).…”

Single-shot dual-energy x-ray imaging with a flat-panel sandwich detector for preclinical imaging

“…Each FPD consists of a commerciallyavailable terbium-doped gadolinium oxysulfide (Gd 2 O 2 S:Tb) scintillator optically coupled to a complementary metal-oxide semiconductor (CMOS) matrix-addressed photodiode array (RadEye1™, Teledyne Rad-icon Imaging Corp., Sunnyvale, CA). The front and rear scintillators are Min-R™ 2000 (34 mg cm À2 ) and Lanex™ Fast (48 mg cm À2 ) respectively [17]. The rear scintillator is thicker to achieve high quantum efficiency with the higher-energy spectrum.…”

Optical photon transport in powdered‐phosphor scintillators. Part II. Calculation of single‐scattering transport parameters

“…11 The polyethylene terephthalate (PET) support also contains TiO 2 particles providing a reflectivity of ≈ 0.88 at that 225 surface. The Lanex Fast Front screen will be assumed to have the same structure but a reduced phosphor thickness of 110 μm.…”

“…The Lanex Fast Front screen will be assumed to have the same structure but a reduced phosphor thickness of 110 μm. 11 The dose-deposition in the two screens was calculated using the DOSRZnrc (EGSnrc) Monte Carlo code 23 and a narrow pencil beam of radius 1 μm. All interaction processes were turned on in EGSnrc (notably atomic relaxations).…”