| 具有可变超松弛因子的OSEM在PET重建中的应用 |
| |
| 引用本文： | 曾妍婷,朱宏擎. 具有可变超松弛因子的OSEM在PET重建中的应用[J]. 武汉理工大学学报(交通科学与工程版), 2007, 31(1): 111-114 |
| |
| 作者姓名： | 曾妍婷 朱宏擎 |
| |
| 作者单位： | 1. 武汉理工大学现代教育技术中心,武汉,430063
2. 东南大学影像科学与技术实验室,南京,210096 |
| |
| 基金项目： | 国家重点基础研究发展计划(973计划) |
| |
| 摘 要： | 基于最大似然期望法(ML-EM)重建的图像质量好,但因其收敛速度太慢,而难以直接应用于临床.有序子集最大期望法(OSEM)具有较高的重建图像质量和较短的计算时间,超松弛因子(OR)有可灵活调节超松弛因子和加速收敛两种功效.文中将OSEM和OR有机地结合起来用于PET图像重建,形成可变超松弛因子的OSEM重建算法(OR-OSEM).该方法综合了上述两种算法的优点,具有可根据需要灵活改变子集数和超松弛因子的功能.计算机仿真模拟和临床PET投影数据的重建结果表明了该方法的有效性.
|
| 关 键 词： | 图像重建 超松弛因子 正电子发射成像 OSEM算法 |
| 修稿时间： | 2006-11-20 |
Application of OSEM with Variable Overrelaxation in PET Reconstruction |
| |
| Zeng Yanting,Zhu Hongqing. Application of OSEM with Variable Overrelaxation in PET Reconstruction[J]. journal of wuhan university of technology(transportation science&engineering), 2007, 31(1): 111-114 |
| |
| Authors: | Zeng Yanting Zhu Hongqing |
| |
| Affiliation: | 1.Technology Center of Modern Education, Wuhan University of Technology, Wuhan 430063;2.Lab of Image Science and Technology, Southeast University, Nanjing 210096 |
| |
| Abstract: | Although ML-EM is a perfect reconstruction algorithm,its slow convergence rate obstructs its direct use in practice.OSEM has good reconstructed image quality and uses less computation time.Overrelaxation technique has adjustable relaxed parameters and speeded convergence function.A variable overrelaxation OSEM(OR-OSEM) algorithm with both advantages is proposed in this paper.It can change order set numbers and overrelaxation parameters expediently according to real need.Results of computer simulated data and clinical PET projection data demonstrated that this algorithm could be used to get good quality image. |
| |
| Keywords: | image reconstruction overrelaxed factor PET OSEM algorithm |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
