CAJ | 학술논문

目的设计和研究全数字化小动物PET符合探测系统,并对其进行初步性能评估.方法采用基于单事件列表式数据的符合判选模式,运用数字信号处理技术对单事件数据集进行晶格分割、能量校正、时间校正以及符合事件判断等操作,获取可供图像重建使用的数据.结果硅酸钇镥闪烁晶体(LYSO)晶体阵列点阵图可清晰分辨13×13个晶格点.Micro-Derenzo假体符合时间分布图的半高全宽为1.36 ns.Micro-Derenzo假体重建图像可清晰分辨直径为1.2 mm的小孔.结论硬件软件化的符合探测模式可以提供满意的性能指标,满足全数字化小动物PET的设计需求.
목적 설계화연구전수자화소동물PET부합탐측계통,병대기진행초보성능평고.방법 채용기우단사건렬표식수거적부합판선모식,운용수자신호처리기술대단사건수거집진행정격분할、능량교정、시간교정이급부합사건판단등조작,획취가공도상중건사용적수거.결과 규산을노섬삭정체(LYSO)정체진렬점진도가청석분변13×13개정격점.Micro-Derenzo가체부합시간분포도적반고전관위1.36 ns.Micro-Derenzo가체중건도상가청석분변직경위1.2 mm적소공.결론 경건연건화적부합탐측모식가이제공만의적성능지표,만족전수자화소동물PET적설계수구.
Objective To investigate and design a coincidence detection system for an all-digital small animal PET scanner and evaluate its preliminary performance properties.Methods This coincidence module adopted a coincidence identification mode based on singles data in list-mode.Using digital signal processing technology,energy calibration,crystal identification,timing alignment and coincidence events extraction were performed on singles data in list-mode.The obtained data could be used for image reconstruction.Results The 13 × 13 crystal array was well recognized by the position histogram of one lutetium yttrium orthosilicate (LYSO) crystal block.In the coincidence timing histogram of the micro-Derenzo phantom,1.36 ns full width at half maximum was obtained.The rods with a diameter of 1.2 mm were clearly displayed in the reconstructed image of the micro-Derenzo phantom.Conclusion The coincidence module can provide satisfactory performance to meet the design needs of an all-digital small animal PET scanner.