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Evaluation of the co-doped LSO:Ce,Ca scintillator crystal in the X-ray energy range from 50 to 140kVp for medical imaging applications

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7 Author(s)
Stratos, D. ; Dept. of Med. Phys., Univ. of Patras, Patras, Greece ; Christos, M. ; George, P. ; Ioannis, V.
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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.

Published in:

Imaging Systems and Techniques (IST), 2010 IEEE International Conference on

Date of Conference:

1-2 July 2010

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