Evaluating phosphors for use in X-ray image detectors by the effective performance index (EPI) method: application to Eu3+ activated yttrium based materials.
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.
Cavouras
D
D
Department of Medical Instrumentation Technology, Technological Educational Institution of Athens, Greece. cavouras@medisp.teiath.gr
Kandarakis
I
I
Prassopoulos
P
P
Kanellopoulos
E
E
Nomicos
C D
CD
Panayiotakis
G S
GS
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
D005063:Europium; D015019:Yttrium