TY - CONF
TI - Monte Carlo study of LSO gamma-ray detectors for PET.
AU - Tzanakos, G
AU - Monoyiou, E
AU - Alexandratou, E
PY - 1998
SP - 797-808
PB - SPIE - INT SOC OPTICAL ENGINEERING
T2 - PHYSICS OF MEDICAL IMAGING
TODO - 10.1117/12.317087
TODO - null
TODO - 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
EGO, small decay time, and high light output. As such, it should have an
overall behavior better than that of EGO. 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 that for
400 keV threshold this efficiency is large even for 2 cm crystals and
comparable to that of EGO. 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.
ER -