Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Reexamination Certificate
2006-08-29
2008-11-04
Hannaher, Constantine (Department: 2884)
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
Reexamination Certificate
active
07446323
ABSTRACT:
In a photostimulable storage phosphor screen or panel wherein said screen comprises storage phosphor particles dispersed in a binder and wherein said particles have a particle size distribution having a d99which is not more than 15 μm, said d99expressing a grain size limit above which not more than 1% by weight of phosphor powder particles is present in said phosphor powder, its structure noise parameter DQE2relexceeds a value of 0.70 and a ratio of d99(expressed in μm) and DQE2relis not more than 25:1, wherein DQE2relis the ratio of the DQE2obtained at a dose of 22 mR to the DQE2obtained at a dose of 3 mR, as expressed in formula (I)in-line-formulae description="In-line Formulae" end="lead"?DQE2rel=DQE2(22 mR))/DQE2(3 mR) (I)in-line-formulae description="In-line Formulae" end="tail"?which is representative for an amount of screen-structure noise produced by said screen or panel in the complete spatial frequency range.
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Modeling Quantum Noise of Phosphors Used in Medical X-Ray Imaging Detectors, N. Kalivas et al., Nuclear Instruments and Methods in Physics Research A 430 (1999) 559-569.
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Leblans Paul
Mans Ilse
Neyens Ludo
Tahon Jean-Pierre
Agfa-Gevaert
Guy Joseph T.
Hannaher Constantine
Nexsen Pruet , LLC
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