DocumentCode :
1092795
Title :
Luminescence Properties of (Lu,Y)2SiO5:Ce and Gd2SiO5
Author :
Valais, Ioannis G. ; Kandarakis, Ioannis S. ; Nikolopoulos, Dimitris N. ; Michail, Christos M. ; David, Stratos L. ; Loudos, George K. ; Cavouras, Dionisis A. ; Panayiotakis, George S.
Author_Institution :
Dept. of Med. Phys., Univ. of Patras, Athens
Volume :
54
Issue :
1
fYear :
2007
Firstpage :
11
Lastpage :
18
Abstract :
The luminescence of (Lu,Y)2SiO5 : Ce (LYSO:Ce) and Gd2SiO5:Ce (GSO:Ce) crystals was studied for use in tomographic medical x-ray imaging. LYSO:Ce and GSO:Ce are high density (7.1 g/cm3 and 6.71 g/cm3 respectively), high atomic number (71 for Lu and 64 for Gd), non-hydroscopic, and short decay time (40 ns and 60 ns respectively) scintillators. Evaluation was performed by determining: 1) the luminescence efficiency (LE) (emitted light energy flux over incident x-ray energy flux) in x-ray energies employed in general x-ray imaging (40-140 kVp) and in mammographic x-ray imaging (22-49 kVp), 2) the light emission spectrum, determined at various x-ray energies (22-140 kVp), and 3) the spectral compatibility to optical photon detectors, incorporated in medical imaging systems. Both scintillation materials exhibited adequately high LE in the x-ray diagnostic energy range, with LYSO:Ce´s LE being distinctively higher. LYSO:Ce and GSO:Ce were found most compatible with the S-20 photocathode (0.9 for both materials) and adequately compatible to the amorphous silicon photodiode (0.74 for both materials), incorporated in many digital x-ray detectors
Keywords :
X-ray detection; cerium; computerised tomography; diagnostic radiography; gadolinium compounds; lutetium compounds; mammography; photoluminescence; scintillation; solid scintillation detectors; yttrium compounds; (LuY)2SiO5:Ce; Gd2SiO5:Ce; X-ray diagnostic energy; X-ray energy flux; X-ray excitation; atomic number; computerised tomography; digital X-ray detectors; light emission spectrum; light energy flux; luminescence efficiency; luminescence properties; mammographic X-ray imaging; medical imaging systems; nonhydroscopic scintillator; optical photon detectors; scintillation materials; single crystal scintillators; tomographic medical X-ray imaging; Biomedical imaging; Biomedical optical imaging; Crystals; Luminescence; Medical diagnostic imaging; Optical materials; Performance evaluation; Tomography; X-ray detectors; X-ray imaging; Inorganic scintillators; LYSO:Ce; luminescence efficiency; matching factor; radiation detectors;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.2006.888813
Filename :
4089185
Link To Document :
