计算机应用 ›› 2013, Vol. 33 ›› Issue (01): 53-56.DOI: 10.3724/SP.J.1087.2013.00053

• 多媒体处理技术 • 上一篇    下一篇

迭代图像重建中系统矩阵与重建图像质量关系研究

陈洪磊,贺建峰,刘俊卿,马磊   

  1. 昆明理工大学 信息工程与自动化学院, 昆明 650500
  • 收稿日期:2012-07-09 修回日期:2012-08-17 出版日期:2013-01-01 发布日期:2013-01-09
  • 通讯作者: 贺建峰
  • 作者简介:陈洪磊(1986-),男(傣族),云南普洱人,硕士研究生,主要研究方向:医学图像重建;贺建峰(1965-),男,云南开远人,教授,博士,主要研究方向:医学图像处理;刘俊卿(1986-),男,河南洛阳人,硕士研究生,主要研究方向:医学图像重建;马磊(1978-),男(回族),云南昆明人,讲师,硕士,主要研究方向:信号处理、软件工程。
  • 基金资助:

    留学回国人员科研启动基金资助项目(2010-1561);云南省教育厅科学研究基金资助项目(2012J090)

Study on relationship between system matrix and reconstructed image quality in iterative image reconstruction

CHEN Honglei,HE Jianfeng,LIU Junqing,MA Lei   

  1. College of Information Engineering and Automation, Kunming University of Science and Technology, Kunming Yunnan 650500, China
  • Received:2012-07-09 Revised:2012-08-17 Online:2013-01-01 Published:2013-01-09
  • Contact: HE Jianfeng

摘要: 针对现有系统矩阵算法复杂、效率低的问题,提出了一种简易的线段加权算法。对比传统线段加权算法,所提算法大大减少了对直线与网格相交情况的判断,使用二维方式对网格进行编号,并且基于提出的算法对传统线段加权法计算系统矩阵过程进行了改进。采用改进方法计算的系统矩阵重建图像,并且对重建图像质量进行评价。实验结果表明,所提算法的运算速度比Siddon改进算法提高了3倍以上,并且重建图像的质量随着线段加权法中计算线段数目增加而逐步提高。

关键词: 系统矩阵, 投影系数, 线段加权, Siddon改进算法, 图像质量评价

Abstract: In view of complicated and inefficient calculation of system matrix, a simple length weighted algorithm was proposed. Compared with the traditional length weighted algorithm, the proposed algorithm reduced situations of the intercepted photon rays with the grid and the grid index of the proposed approach was determined in the two-dimensional coordinate. The computational process of the system matrix was improved based on the proposed algorithm. The image reconstructed with the system matrix was constructed through the new process, and the quality of the reconstructed image was assessed. The experimental results show that the operation speed of the proposed algorithm is more than three times faster than Siddon improved algorithm, and the more lengths in the length weighted algorithm get considered, the better quality of the reconstructed image has.

Key words: system matrix, projection coefficient, length weighted, Siddon improved algorithm, image quality assessment

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