Monte Carlo study of LSO y-ray detectors for PET

George S. Tzanakos; E. Monoyiou; Eleni Alexandratou

doi:10.1117/12.317087

24 July 1998 Monte Carlo study of LSO γ-ray detectors for PET

George S. Tzanakos, E. Monoyiou, Eleni Alexandratou

Proceedings Volume 3336, Medical Imaging 1998: Physics of Medical Imaging; (1998) https://doi.org/10.1117/12.317087
Event: Medical Imaging '98, 1998, San Diego, CA, United States

Abstract

We have made a detailed study of the response of LSO detectors to 511 keV (gamma) -rays. The LSO, discovered recently, has a density greater than BGO, small decay time, and high light output. As such, it should have an overall behavior better than that of BGO. We have modeled a (gamma) -ray detector using an LSO crystal of rectangular cross-section attached to a photomultiplier tube (PMT). We used our PET simulation package to study the energy resolution, efficiency, and timing resolution for various crystal sizes and various energy thresholds. The simulation takes into account the interactions of (gamma) -rays in the crystal via Compton and photoelectric effects, the production and transport of scintillation photons, the productions of photoelectrons in the PMT and the anode signal formation. We have estimated the efficiency versus energy threshold for various lengths of the LSO crystal and we find the for 400 keV threshold this efficiency is large even for 2 cm crystals and comparable to that of BGO. We also estimated the timing resolution (FWHM) versus crystal length for various energy thresholds. The timing resolution is comparable to that of CeF₃ detectors. The energy resolution is about 10% (FWHM), which allows one to set the energy threshold fairly high.

Citation Download Citation

George S. Tzanakos, E. Monoyiou, and Eleni Alexandratou "Monte Carlo study of LSO γ-ray detectors for PET", Proc. SPIE 3336, Medical Imaging 1998: Physics of Medical Imaging, (24 July 1998); https://doi.org/10.1117/12.317087

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