NDLI: Performance assessment of pixelated LaBr/sub 3/ detector modules for TOF PET

Content Provider	IEEE Xplore Digital Library
Author	Kuhn, A. Surti, S. Karp, J.S. Muehllehner, G. Newcomer, F.M. VanBerg, R.
Copyright Year	2004
Description	Author affiliation: Dept. of Radiol., Pennsylvania Univ., Philadelphia, PA, USA (Kuhn, A.; Surti, S.; Karp, J.S.)
Abstract	Our recent measurements with pixelated LaBr/sub 3/ Anger-logic detectors for use in time-of-flight (TOF) PET have demonstrated excellent energy resolution (5.1% at 511 keV) and coincidence time resolution (313 ps FWHM) with small prototype configurations. A full size detector module suitable for a whole-body 3D PET scanner has been constructed based on the prototype designs and consists of 1620 4/spl times/4/spl times/30 mm/sup 3/ LaBr/sub 3/ crystals. We have utilized simulations to guide experimental measurements with the goal of optimizing energy and time resolution in evaluating triggering configurations and pulse shaping needed in a full system. Experimental measurements with the detector module indicate energy and time resolution consistent with our earlier prototypes when measured at low count rate. At very high count rate the energy, time and spatial resolution degrade due to pulse pileup. While it is possible to reduce pulse pileup by using smaller PMTs (i.e., 39 mm instead of 50 mm), we are trying to limit the total number of PMTs needed for a full-scale PET scanner with a large axial field-of-view. Therefore, we have implemented a pulse shaping circuit to improve the detector response and performance at high count rate. Simulations of a complete LaBr/sub 3/ scanner indicate significant improvements in NEC and spatial resolution can be achieved using pulse shaping.
Starting Page	3402
Ending Page	3406
File Size	1141673
Page Count	5
File Format	PDF
ISBN	0780387007
ISSN	10823654
e-ISBN	0780387015
DOI	10.1109/NSSMIC.2004.1466617
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-10-16
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Energy measurement Time measurement Detectors Energy resolution Spatial resolution Prototypes Pulse shaping methods Whole-body PET Crystals Pulse measurements
Content Type	Text
Resource Type	Article

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