Imaging properties of cerium doped Yttrium Aluminum Oxide (YAP: Ce) powder scintillating screens under X-ray excitation

被引：7
作者：
Kalivas, N.
Valais, I.
Salemis, G.
Karagiannis, C.
Konstantinidis, A.
Nikolopoulos, D.
Loudos, G.
Sakelios, N.
Karakatsanis, N.
Nikita, K.
Gayshan, V. L.
Gektin, A. V.
Sianoudis, I.
Giokaris, N.
Nomicos, C. D.
Dimitropoulos, N.
Cavouras, D.
Panayiotakis, G.
Kandarakis, I.
机构：
[1] Technol Educ Inst Athens, Dept Med Instruments Technol, Athens 12210, Greece
[2] Greek Atom Energy Commiss, Aghia Paraskevi 15310, Greece
[3] Univ Patras, Sch Med, Dept Med Phys, Patras 26500, Greece
[4] Natl Tech Univ Athens, Dept Elect & Comp Engn, Zougrafos 15780, Greece
[5] Inst Scintillat Mat, UA-310072 Kharkov, Ukraine
[6] Technol Educ Inst Athens, Dept Phys Chem & Mat Technol, Athens 12210, Greece
[7] Natl Capodistrian Univ Athens, Dept Phys, Athens 15771, Greece
[8] Inst Accelerating Syst & Applicat, Athens 10024, Greece
[9] Technol Educ Inst Athens, Dept Electron, Athens 12210, Greece
[10] Euromed Med Ctr, Dept Med Imaging, Athens 11527, Greece
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2006年 / 569卷 / 02期
关键词：
scintillators; image quality; radiation detectors; YAP : Ce; CsI;
D O I：
10.1016/j.nima.2006.08.020
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The aim of the present study was to evaluate the imaging performance of YAP:Ce powder scintillating screens under exposure conditions employed in diagnostic radiology (50-140 kV). Various screens were prepared in our laboratory from YAP: Cc powder (Phosphor Technology, Ltd.), with coating thickness ranging from 53 to 110 mg/cm(2). The imaging performance of the screens was assessed by experimental determination of the modulation transfer function (MTF) and the noise transfer function (NTF). MTF was determined by the edge spread function (ESF) method while NTF was estimated by noise power spectrum (NPS) measurements after uniform screen irradiation. In addition, parameters related to overall image quality, such as the signal-to-noise ratio transfer (MTF/NTF), were estimated. WE curves were affected by the beam hardening effects caused by the patient simulating 20 mm thick aluminum phantom. Under these conditions MTF values were found to increase with the mean X-ray photon energy. A similar effect was observed for NTF curves. Results were compared with data obtained on CsI:Tl scintillator. Taking into consideration the very fast response of YAP:Ce, these data may be of interest in designing X-ray imaging detectors. (c) 2006 Elsevier B.V. All rights reserved.
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页码：210 / 214
页数：5
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