DocumentCode :
1568939
Title :
Evaluation of the co-doped LSO:Ce,Ca scintillator crystal in the X-ray energy range from 50 to 140kVp for medical imaging applications
Author :
Stratos, David ; Christos, Michail ; George, Panayiotakis ; Ioannis, Valais ; George, Fountos ; Costantinos, Nomicos ; Ioannis, Kandarakis
Author_Institution :
Dept. of Med. Phys., Univ. of Patras, Patras, Greece
fYear :
2010
Firstpage :
253
Lastpage :
255
Abstract :
Cerium doped Lutetium oxyorthosilicate (LSO) is a well-known scintillator that is widely used for gamma-ray detection in counting mode applications. LSO is typically doped with 0.05 - 0.5% Ce while controlling other impurities at low levels. An investigation of the manner in which various co-dopands may influence the scintillation properties, has begun recently. It was found that some co - dopants, particularly Ca+2, have a desirable impact on scintillation properties, leading to improvements in both light yield and decay time that are related to co - dopant concentration. The aim of the present work is to evaluate the performance of four (4) samples with dimensions 5 × 5 × 5 mm3 of LSO:Ce,Ca with different Ca+2 co- dopand concentrations varying from 0.1 to 0.4 %, in the X-ray energy range between 50 and 140 kVp, for possible medical imaging applications. Scintillation measurements were performed using an experimental setup based on a photomultiplier coupled to a light integration sphere. The radioluminescence emission spectra of LSO:Ce,Ca scintillators were measured and the spectral compatibilities to various optical photon detectors incorporated in medical imaging systems were extracted. Results were compared with data on LSO:Ce single crystal scintillator in terms of absolute luminescence efficiency and spectral matching factor.
Keywords :
biomedical imaging; calcium; cerium; gamma-ray detection; luminescence; lutetium compounds; scintillation counters; Lu2SiO5; X-ray energy; decay time; gamma ray detection; light integration sphere; medical imaging; optical photon detector; photomultiplier; radioluminescence emission spectra; scintillator crystal; spectral matching factor; Biomedical imaging; Cerium; Gamma ray detection; Gamma ray detectors; Impurities; Optical coupling; Performance evaluation; Photomultipliers; Solid scintillation detectors; X-ray imaging; Ca; LSO:Ce; co-dopand scintillators; luminescence efficiency;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Imaging Systems and Techniques (IST), 2010 IEEE International Conference on
Conference_Location :
Thessaloniki
Print_ISBN :
978-1-4244-6492-0
Type :
conf
DOI :
10.1109/IST.2010.5548542
Filename :
5548542
Link To Document :
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