Monte Carlo simulation of BaF sub 2 detectors used in time-of-flight positron emission tomography
- Univ. of Washington Medical Center, Seattle, WA (US)
To better understand the performance of the SP3000 time-of-flit PET machine the authors have performed Monte Carlo calculations of photon interactions in a BaF{sub 2} detector module and calculations of crystal optics for BaF{sub 2} UV scintillation light. Evaluated were photon detection sensitivities, the amount of photon spillover, crystal crosstalk, inter-ring miscodes, and true-to-random coincidence ratios as a function of the lower level energy discriminator setting and crystal/photomultiplier tube energy resolution. UV light collection efficiencies for the timing tube and decode tube also were calculated assuming different crystal geometries, reflective materials and reflectances. For a typical SP3000 detector module the detection efficiency for single 511 keV photons varied between 20--60% depending on the angle of incidence. Crosstalk in the same ring was {approximately} 3% and crosstalk between adjacent rings was {approximately} 1%. The optical calculations indicate that the fast light component of BaF{sub 2} produced less than 35 photoelectrons at the timing tube photocathode for a 511 keV photopeak event and less than half this number of photoelectrons at the decode tube.
- OSTI ID:
- 6871894
- Report Number(s):
- CONF-900143-; CODEN: IETNA; TRN: 90-031696
- Journal Information:
- IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA), Vol. 37:2; Conference: Institute for Electronic and Electrical Engineers (IEEE) nuclear science symposium, San Francisco, CA (USA), 15-19 Jan 1990; ISSN 0018-9499
- Country of Publication:
- United States
- Language:
- English
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