计算机工程与应用 ›› 2007, Vol. 43 ›› Issue (26): 187-189.

• 工程与应用 • 上一篇    下一篇

螺旋锥束CT重建Katsevich算法在含噪投影中的应用

曾 理1,2,牛小明2,邹晓兵1,2   

  1. 1.重庆大学 光电技术及系统教育部重点实验室 ICT研究中心,重庆 400044
    2.重庆大学 数理学院,重庆 400044
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-09-11 发布日期:2007-09-11
  • 通讯作者: 曾 理

Spiral cone-beam CT Katsevich reconstruction algorithm applying in noised projections

ZENG Li1,2,NIU Xiao-ming2,ZOU Xiao-bing1,2   

  1. 1.ICT Research Center,Key Laboratory of Optoelectronic Technology and System of the Education Ministry of China,Chongqing University,Chongqing 400044,China
    2.College of Mathematics and Physics,Chongqing University,Chongqing 400044,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-09-11 Published:2007-09-11
  • Contact: ZENG Li

摘要: 针对含有噪声的投影数据,在利用螺旋锥束Katsevich算法进行重建的过程中,首先采用了一种改进的中值滤波方法对投影体数据进行预处理,然后对处理后的投影数据拟合求导来取代Katsevich算法中的直接求导,减小了噪声带来的负面影响。计算机仿真实验结果证实了这种方法的有效性。

关键词: 螺旋锥束CT, Katsevich 算法, 改进的中值滤波, 拟合求导, 图像重建, 计算机仿真

Abstract: The improved median filter is adopted to pretreat the projections which contain random noise and a Little abnormal noise.Then the derivative of the disposed projections is calculated with a fitting method instead of direct derivative one.This method reduces the negative effect coming from the noise.Computer simulation experiment proves the validity of this method.

Key words: spiral cone-beam CT, Katsevich algorithm, improved median filter, fitting derivative, image reconstruction, computer simulation