NDLI: Improved LabPET detectors using Lu:Ce (LGSO) scintillator blocks

Content Provider	IEEE Xplore Digital Library
Author	Bergeron, M. Pepin, C.M. Cadorette, J. Beaudoin, J. Tetrault, M. Davies, M. Dautet, H. Deschamps, P. Ishibashi, H. Kurata, Y. Lecomte, R.
Copyright Year	2010
Description	Author affiliation: Department of Electrical and Computer Engineering, Université de Sherbrooke, QC, Canada (Tetrault, M.) \|\| Sherbrooke Molecular Imaging Center of the CHUS, Sherbrooke, QC, Canada (Cadorette, J.; Beaudoin, J.) \|\| Hitachi Chemical Co., Ltd., Ibaraki, Japan (Ishibashi, H.; Kurata, Y.) \|\| Sherbrooke Molecular Imaging Center and the Department of Nuclear Medicine and Radiobiology, Université de Sherbrooke, Sherbrooke, QC, Canada (Bergeron, M.; Pepin, C.M.; Lecomte, R.) \|\| Excelitas Technologies (formely PerkinElmer Optoelectronics, Vaudreuil, QC, Canada) (Davies, M.; Dautet, H.; Deschamps, P.)
Abstract	The scintillator is one of the key building blocks that critically determine the physical performance of PET detectors. The quest for scintillation crystals with improved characteristics has been crucial in designing scanners with superior imaging performance. Recently, it was shown that the decay time constant of high lutetium content Lu:Ce (LGSO) scintillators can be adjusted between 30 ns and 48 ns by varying the cerium concentration from 0.025 mol% to 0.75 mol%, thus providing interesting characteristics for phoswich detectors. The large light output (90–120% NaI), the better spectral match and the high initial photoelectron rate (∼200 $phe^{−}/ns)$ of these scintillators with avalanche photodiode (APD) readout promise to provide superior energy and timing resolution. Moreover, their improved mechanical properties as compared to conventional LGSO (Lu:Ce) make block array manufacturing readily feasible. To verify these assumptions, new phoswich block arrays made of LGSO-90%Lu with low and high mol% Ce concentrations were fabricated and assembled into LabPET modules. Typical crystal decay time constants were 32 ns and 48 ns, respectively. We therefore report on the initial evaluation of this modified version of the LabPET detector module. Phoswich crystal identification performed using a non-optimized digital pulse shape discrimination algorithm yielded an average 10% error. At 511 keV, energy resolution of 20 ± 2% and 15 ± 1% were obtained, while coincidence timing resolution between 4.9 ± 0.3 ns and 4.1 ± 0.1 ns were achieved. The improved characteristics of this new LGSO-based phoswich detector module are expected to enhance the LabPET scanner performance, first by improving sensitivity due to the overall higher stopping power of the detector module, and second by narrowing the coincidence time window, thus minimizing the random event rate. Altogether these two improvements will significantly enhance the noise equivalent count rate performance of an all LGSO-based LabPET scanner.
Starting Page	1767
Ending Page	1770
File Size	759595
Page Count	4
File Format	PDF
ISBN	9781424491063
ISSN	10957863
e-ISBN	9781424491056
DOI	10.1109/NSSMIC.2010.5874078
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Crystals Detectors Timing Energy resolution Positron emission tomography Current measurement Assembly
Content Type	Text
Resource Type	Article

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