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Optimization of scintillation-detector timing systems using Monte Carlo analysis

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1 Author(s)
Binkley, D.M. ; CTI PET Syst. Inc., Knoxville, TN, USA

Monte Carlo analysis is used to model statistical noise associated with scintillation-detector photoelectron emissions and photomultiplier tube operation. The impulse response of a photomultiplier tube, front-end amplifier, and constant-fraction discriminator (CFD) is modeled so that the effects of front-end bandwidth and constant-fraction delay and fraction can be evaluated for timing-system optimizations. Monte Carlo timing resolution for a bismuth germanate (BGO)/photomultiplier scintillation detector, CFD timing system is presented as a function of constant-fraction delay for 511-keV coincident gamma rays in the presence of Compton scatter. Monte Carlo results are in good agreement with measured results, indicating better timing resolution with decreasing constant-fraction delay. Monte Carlo energy-discrimination performance is experimentally verified along with the timing resolution (Monte Carlo resolution of 3.1 ns FWHM versus measured resolution of 3.3 ns FWHM) for a front-end rise time of 10 ns (10-90%). CFD delay of 8 ns, and CFD fraction of 20%

Published in:

Nuclear Science Symposium and Medical Imaging Conference, 1992., Conference Record of the 1992 IEEE

Date of Conference:

25-31 Oct 1992