|本期目录/Table of Contents|

 基于有限角和计算机层析成像相结合的板状构件成像方法(PDF)

《纳米技术与精密工程》[ISSN:1672-6030/CN:12-1351/O3]

期数:
2017年5期
页码:
366-371
栏目:
精密测量
出版日期:
2017-09-15

文章信息/Info

Title:
 New Method Based on Combination of Limited-Angle and Computed
Laminography Imaging for Plate-Like Objects

 

文章编号:
1672-6030(2017)05-0366-06
作者:
邹晶 曾伟 胡晓东
 (精密测试技术及仪器国家重点实验室(天津大学),天津300072)
Author(s):
 Zou Jing Zeng Wei Hu Xiaodong
 (State Key Laboratory of Precision Measuring Technology and Instruments(Tianjin University),Tianjin 300072,China)
关键词:
 计算机层析成像 全变差最小化 迭代重建 X射线检测
Keywords:
 computed laminography imaging total variation iterative reconstruction X-ray testing
分类号:
TP391
DOI:
10.13494/j.npe.20160106
文献标识码:
A
摘要:
 计算机层析(computed laminography,CL)成像采用射线沿板状构件长宽表面倾斜入射的扫描方式 ,在厚度方向上获取不同断层的投影数据,然后利用此投影数据来重建构件断层图像.但在CL成像中,当倾斜角较大时,投影路径相对较长,对于板状构件中衰减系数大的部分,其投影数据存在一定的缺失.故针对板状构件的无损检测,提出了一种基于有限角和CL成像相结合的扫描方法,利用有限角扫描和CL成像分别采集投影数据,再进行数据融合,通过基于全变差最小化的迭代重建算法重构出扫描区域板状构件的断层图像.仿真实验结果表明,和传统的CL成像方式相比,该方法可以得到更好的图像重建效果.
Abstract:
 Computed laminography (CL) provides a scanning method through whioh X-rays irradiate on the surface of platelike objects in an oblique direction to obtain projection data of different slices, and then the projection data is used to reconstruct slice images. However, when the tilt angle is large in CL imaging, the projection path is relatively long and some projection data is missing for the part with large attenuation coefficient in platelike objects. Therefore, a new method based on the combination of limited-angle and CL imaging is proposed for the non-destructive testing of platelike objects. This method uses limitedangle and CL imaging to acquire the projection data separately, then fuse the data, finally reconstruct the tomographic images of the plate-like object in the scanning area by iterative reconstruction algorithm based on total variation. The simulation results show that,compared with traditional CL imaging, the proposed method can achieve better image reconstruction results.

参考文献/References

备注/Memo

备注/Memo:
收稿日期: 2017-01-06.
基金项目: 国家自然科学基金资助项目(61372144).
作者简介: 邹晶(1980—),女,博士,副研究员.
通讯作者: 邹晶,jingzoutd@tju.edu.cn.
更新日期/Last Update: 2017-09-27