系统仿真学报 ›› 2016, Vol. 28 ›› Issue (12): 3061-3066.doi: 10.16182/j.issn1004731x.joss.201612026

• 仿真应用工程 • 上一篇    下一篇

多层球壳构件FBP重建差异化滤波设计与仿真

夏惊涛, 王群书, 马继明, 黑东炜, 盛亮, 魏福利, 宋顾周   

  1. 强脉冲辐射环境模拟与效应国家重点实验室(西北核技术研究所),陕西 西安 710024
  • 收稿日期:2015-03-30 修回日期:2015-05-11 出版日期:2016-12-08 发布日期:2020-08-13
  • 作者简介:夏惊涛(1981-),男,湖北荆州,博士,高工,研究方向为辐射成像技术。
  • 基金资助:
    强脉冲辐射环境模拟与效应国家重点实验室预研基金(SKLIPR14017)

Design and Simulation of Regional Differently Filtering Method of FBP Algorithm for Multilayer Spherical Shell

Xia Jingtao, Wang Qunshu, Ma Jiming, Hei Dongwei, Sheng Liang, Wei Fuli, Song Guzhou   

  1. State Key Laboratory of Intense PulsedRadiation Simulation and Effect(Northwest Institute of Nuclear Technology), Xi’an 710024, China
  • Received:2015-03-30 Revised:2015-05-11 Online:2016-12-08 Published:2020-08-13

摘要: 针对高密度差多层球壳这一类特殊工件的CT检测技术研究,构建平行束CT投影及图像重建系统模型,开发建立CT研究软件平台,结合理论分析和仿真着重研究基于滤波反投影(FBP)理论重建图像的滤波处理方法。首先通过限定扫描方式使多层球壳截面的CT投影正弦图呈现空间区域性分布,结合图像分析和先验知识对其进行分割,再根据重建细节的频率特征和检测需求,对不同区域投影分别采用RL和SL函数进行针对性的滤波处理。仿真结果表明,相对于传统FBP算法中的单一函数滤波,所提出的分区域差异化滤波方法能够获得更好的图像重建效果。

关键词: CT, 滤波反投影, 图像重建, 多层球壳, 仿真

Abstract: Aiming at the CT detection technology research for multilayer spherical shell with great density difference, the parallel beam CT projection and image reconstruction system model were built and a software platform was developed. Combined with theoretical analysis and computer simulation, the filtering method of FBP theory for image reconstruction was focused on. A special scanning mode was limited to make the projection sinogram of multilayer spherical shell show a regional spatial distribution, which was divided up combined with image analysis and priori knowledge. Then, according to the frequency characteristic and reconstruction demand, RL and SL functions were respectively used to filter projection data of different regions. The simulation results show that the proposed method can obtain better image reconstruction results compared with the single function filter in the traditional FBP algorithm.

Key words: CT, filter back projection, image reconstruction, multilayer sphere, simulation

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