Title :
Monte Carlo simulation of a TOF PET scanner. I. Preliminary report
Author :
Muzic, R.F., Jr. ; Nelson, A.D. ; Miraldi, F.
Author_Institution :
Case Western Reserve Univ., Cleveland, OH, USA
Abstract :
A Monte Carlo simulation was developed to study scattered radiation in the SP3000 (Scanditronix/PETT) time-of-flight (TOF) positron emission tomography (PET) scanner. The simulation was based on MCNP, a general-purpose radiation transport code, which was modified for requirements specific to PET and the SP3000: camera wobble, collinear 0.511-MeV annihilation source photons, and coincidence detection. Two detector rings, 640 detectors, of the SP3000 were modeled using MCNP´s geometry description language, thus simulating one cross and two straight image planes. For each coincidence, information regarding the scattering of the detected photons was maintained. Good agreement of measured and simulated coincidence sensitivities, energy spectra, and scatter fraction provided strong evidence that the simulation was accurate. Simulation of a distributed source in a 22-cm-diameter water-filled Lucite cylinder indicates that the majority of scattered coincidences originate from photon scattering in the camera.<>
Keywords :
biomedical equipment; computerised tomography; radioisotope scanning and imaging; 0.511 MeV; 22 cm; camera wobble; collinear annihilation source photons; cross image plane; distributed source; energy spectra; general-purpose radiation transport code; geometry description language; nuclear medicine; scatter fraction; scattered coincidences; scattered radiation; straight image plane; time of flight positron emission tomography scanner; water-filled Lucite cylinder; Cameras; Computational modeling; Detectors; Electromagnetic scattering; Energy measurement; Geometry; Laboratories; Particle scattering; Positron emission tomography; Solid modeling;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Santa Fe, NM, USA
Print_ISBN :
0-7803-0513-2
DOI :
10.1109/NSSMIC.1991.259195
