title: Evaluating phosphors for use in X-ray image detectors by the effective performance index (EPI) method: application to Eu3+ activated yttrium based materials.
abstract: Phosphor materials used in X-ray image receptors were evaluated by the effective performance index (EPI). EPI describes the dependence of image quality on X-ray to light energy conversion and light diffusion processes. EPI was experimentally determined by means of X-ray luminescence (XLE) and MTF measurements performed on Y2O2S:Eu, Y2O3:Eu, and YVO4:Eu phosphors. The spectral compatibility of these materials with optical detectors (films, photocathodes, photodiodes) was also determined. Highest EPI values were obtained for Y2O2S:Eu-GaAs combination at mammographic energies. All phosphors could be of use in digital X-ray imaging being adequately compatible to silicon photodiodes employed in digital detectors.
authors.affiliation: Department of Medical Instrumentation Technology, Technological Educational Institution of Athens, Greece. cavouras@medisp.teiath.gr
authors.forename: D
authors.initials: D
authors.lastname: Cavouras
authors.forename: I
authors.initials: I
authors.lastname: Kandarakis
authors.forename: P
authors.initials: P
authors.lastname: Prassopoulos
authors.forename: E
authors.initials: E
authors.lastname: Kanellopoulos
authors.forename: C D
authors.initials: CD
authors.lastname: Nomicos
authors.forename: G S
authors.initials: GS
authors.lastname: Panayiotakis
mesh_terms: D005063:Europium; D006801:Humans; D008163:Luminescent Measurements; D008422:Materials Testing; D011856:Radiographic Image Enhancement / Q000379:methods*; D013679:Technology, Radiologic; D014963:X-Ray Intensifying Screens; D015019:Yttrium
chemical_list: D005063:Europium; D015019:Yttrium