摘要
对高密度差多层球壳结构件进行双能CT检测,需要研究同时基于高低能射线两套投影数据的图像重建方法。先分别重建再进行图像融合的方法,不能充分利用两种能量射线投影的互补信息,重建图像质量不高。针对高密度差多层球壳结构特征,通过设计限定投影扫描方式获取区域分布明确的高、低能射线投影正弦图,基于正弦图区域分割重组和交集数据等值化一致性处理实现双能投影数据融合,在此基础上完成图像重建。根据以上设计归纳出基于投影融合的多层球壳双能CT重建算法,仿真结果表明算法可行,且重建结果明显好于基于图像融合的方法。
Using dual energy CT method to detect multilayer spherical shell components with great density difference,it is necessary to study the image reconstruction method based on two sets of projection data.The Method of Reconstructed at First and then Fused Based on Images cannot make full use of dual energy X-ray projection information,by which simulation research shows it is difficult to get good reconstructed image.On this basis,the paper focuses on the Method of Fused Based on Projection Data at First and then Reconstructed.Firstly,considering the structure characteristics of the multilayer spherical shell components with great density difference,the X-ray projection sinogram with clear regional distribution can be obtained through a specially designed scanning mode.Then extract effective projection data respectively from the high and low energy X-ray projection sinogram,do the consistency processing,and integrate them to become one sinogram.Finally use the FBP algorithm to complete the image reconstruction process.The concrete realization of the algorithm based on projection data fuse for dual energy CT of multilayer spherical shell is summarized,and computer simulation shows that better reconstructed images can be obtained.
作者
夏惊涛
盛亮
黑东炜
唐波
陈俊
魏福利
马戈
罗剑辉
Xia Jingtao;Sheng Liang;Hei Dongwei;Tang Bo;Chen Jun;Wei Fuli;Ma Ge;Luo Jianhui(National Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Northwest Institute of Nuclear Technology,Xi’an 710024,China)
出处
《强激光与粒子束》
CAS
CSCD
北大核心
2023年第10期127-131,共5页
High Power Laser and Particle Beams
关键词
双能CT检测
图像重建算法
多层球壳
仿真研究
dual energy CT
image reconstruction algorithm
multilayer shells
simulation research
