Image Quality Assessment of a CMOS/Gd2O2S:Pr,Ce,F X-ray Sensor

[摘要] The aim of the present study was to examine the image quality performance of a CMOS digital imaging optical sensor coupled to custom made gadolinium oxysulfide powder scintillators, doped with praseodymium, cerium and fluorine (Gd2O2S:Pr,Ce,F) screens. The screens, with coating thicknesses 35.7 and 71.2 mg/cm2, were prepared in our laboratory from Gd2O2S:Pr,Ce,F powder (Phosphor Technology, Ltd) by sedimentation on silica substrates and were placed in direct contact with the optical sensor. Image quality was determined through a single index image quality parameter (information capacity). The CMOS sensor/Gd2O2S:Pr,Ce,F screens combinations were irradiated under the RQA-5 (IEC 62220-1) beam quality. The detector response function was linear for the exposure range under investigation. Under the general radiography conditions, both Gd2O2S:Pr,Ce,F screen/CMOS combinations exhibited comparable overall imaging properties, in terms of the information capacity, to previously published scintillators, such as Gd2O2S:Eu.

[发布机构] Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, Technological Educational Institute of Athens, Egaleo, Athens; 122 10, Greece^1;Faculty of Chemistry, Wroclaw University, 14F Joliot-Curie Street, Wroclaw; 50-383, Poland^2;Medical Radiological Technology, Faculty of Health and Caring Professions, Technological Educational Institute of Athens, Athens; 122 10, Greece^3;Department of Medical Physics, Faculty of Medicine, University of Patras, Patras; 265 00, Greece^4

[效力级别] 医药卫生 [学科分类] 卫生学

[关键词] Detector response functions;Gadolinium oxysulfides;Image quality assessment;Imaging properties;Inorganic scintillator;Phosphor technologies;Powder scintillator;Quality performance