NDLI: Luminescence properties of LuYSiO/sub 5/:Ce, Gd/sub 2/SiO/sub 5/:Ce, and CsI:Tl single crystal scintillators under X-ray excitation, for use in medical imaging systems

Content Provider	IEEE Xplore Digital Library
Author	Valais, I.G. Kandarakis, I.S. Nikolopoulos, D.N. Sianoudis, I.A. Loudos, G.K. Giokaris, N.D. Nikita, K.S. Cavouras, D.A. Dimitropoulos, N. Nomicos, C.D. Panayiotakis, G.S.
Copyright Year	2005
Description	Author affiliation: Dept. of Med. Instrum. Technol., Technol. Educ. Instn. of Athens, Greece (Valais, I.G.; Kandarakis, I.S.; Nikolopoulos, D.N.)
Abstract	The luminescence of LuYSiO/sub 5/:Ce (LYSO:Ce) and Gd/sub 2/SiO/sub 5/:Ce (GSO:Ce) crystals was studied for use in tomographic medical X-ray imaging. Both crystals were compared to CsI:Tl scintillator, used in X-ray and gamma-ray imaging. LYSO:Ce and GSO:Ce are high density (7.1 g/cm/sup 3/ and 6.71 g/cm/sup 3/ respectively), high atomic number (71 for Lu and 64 for Gd), non-hydroscopic, and short decay time (40 ns and 60 ns respectively) scintillators. CsI:Tl is a slightly hygroscopic, high light yield (/spl ges/10/sup 4/ photons/MeV) scintillator but of relatively slow decay time (>200 ns). Evaluation was performed by determining: 1) the absolute luminescence efficiency (emitted light flux over incident X-ray exposure) in X-ray energies employed in general X-ray imaging (40-140 kV) and in mammographic X-ray imaging (22-49 kV), 2) the light emission spectrum, determined at various X-ray energies (22-140 kV), and 3) the spectral compatibility to optical photon detectors incorporated in medical imaging systems. The light emission performance of the three scintillation materials studied, were found adequately high for X-ray imaging. LYSO:Ce and GSO:Ce were found most efficient (between 8 and 12/sub /spl mu/W/spl times/m//sup -2/) in the range from 40 to 60 kV. LYSO:Ce and GSO:Ce were found adequately most compatible with the S-20 photocathode (0.902 and 0.903 respectively against 0.763 of CsI:Tl) and adequately compatible to a-Si photodiode (0.705 and 0.737 respectively against 0.851 of CsI:Tl).
Starting Page	1323
Ending Page	1327
File Size	247491
Page Count	5
File Format	PDF
ISBN	0780392213
ISSN	10957863
DOI	10.1109/NSSMIC.2005.1596564
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-23
Publisher Place	Puerto Rico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Luminescence X-ray imaging Crystals Biomedical imaging Tomography Nuclear imaging Performance evaluation Biomedical optical imaging Stimulated emission Optical detectors
Content Type	Text
Resource Type	Article

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