I. Kandarakis, D. Cavouras, G. Panayiotakis, E. Papadopoulou, C. Nomicos
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Signal propagation in rare earth image receptors for digital mammography applications
Signal conversion and propagation in image receptors were studied employing laboratory prepared Gd/sub 2/O/sub 2/S:Tb and La/sub 2/O/sub 2/S:Tb phosphor screens. The optical signal emitted by the screens per unit of X-ray exposure was experimentally and theoretically evaluated in the mammographic energy range. Parameters related to signal propagation (light absorption, scattering, reflection, and optical pulses statistical distribution), intrinsic X-ray to light conversion efficiency, and electron signal generated by the photodetector were studied. Image receptors employing Gd/sub 2/O/sub 2/S:Tb screens produce higher optical and electron signal intensities whereas receptors with La/sub 2/O/sub 2/S:Tb screens give better optical pulse statistics, resulting in noise reduction.
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