Analysis And Simulation Of The Physical Processes In A Pet Imaging System

This work is supported by Neusoft Positron Company.Positron emission tomography (PET) is one of the most advanced nucleus medicine diagnosis and research techniques which detect the metabolic changes, biochemical reactions and function of animal/human internal organs by noninvasive, quantitative and dynamic methods, and PET also plays an important role in the prevent and therapy of major disease. In this paper, we discuss the result of our analysis and simulation on the mPowerPET system by GATE simulation tool.GATE (Geant4 Application for Tomographic Emission) is a Mont Carlo simulation platform for nuclear medical imaging, which is based on the Geant4 toolkit package developed within Open GATE Collaboration. Now, it is an extensive assist in the design of new medical imaging devices (such as:PET, SPECT and so on), it can be used to assess new implementations of scatter correction techniques and optimize scan protocols. It is also used to module the mPowerPET systems prototype consisting of entire physics process. Taking into account the mPowerPET prototype geometry, the list of coincidences events output by the GATE was post-processed off-line using a C-code according to radial distance coding, storage in Sino gram array and displays it.In this thesis, we transplanted the GATE simulation tool from Linux system to Windows system by Linux dummy tool and added the network control interface to implement the distributed computing platform for PET simulation with GATE system. The aim of the study was to improve the simulation speed for GATE system. Base on the distributed computing platform, we performed the calculations of gamma photons acolinearity angle distribution and positron annihilation distance, besides these, we also analyzed the energy window and crystal efficiency utilize rate for LSO and BGO crystal. Furthermore, we found that the simulation data is one of the most important guidance's for realizing the PET system.