在Linux系统中实现对PET的仿真，给予VGATE平台实现，初步提出变结构的设想，提高成像的空间分辨率，减弱DOI效应的影响。(In the Linux system, the simulation of PET is realized and the VGATE platform is implemented. The tentative idea of changing the structure is proposed, the spatial resolution of the imaging is improved and the influence of the DOI effect is weakened.)