实验科学与技术2019，Vol.17Issue(1)：12-16,36,6.DOI:10.3969/j.issn.1672-4550.2019.01.003
基于优化的CT系统标定与滤波反投影图像重建
CT System Calibration and Filtered Back-projection Image Reconstruction Based on Optimized Model
摘要
Abstract
In this paper, the CT system calibration model and the CT system reconstruction model are established.The accuracy and stability of the calibration model are analyzed, and the calibration template with higher accuracy and stability and the corresponding calibration model are designed.For the calibration problem of CT system, combined with geometric knowledge and receiving information, the equations are solved jointly.The gain coefficient, the detector cell spacing and parallel ray equations in all directions are calculated to establish an optimization model and the rotation center coordinates are obtained by the genetic algorithm.For the CT image reconstruction problem, the relationship between the attenuation coefficient and the pixel value is first deduced, and then the filter is used for back-projection reconstruction.Finally, the accuracy and stability of the calibration template are analyzed by computer forward simulation and reverse solution.Finally, a rectangular-circle template with high stability and a rectangular-oval-circle template with high precision are designed.关键词
CT系统标定/滤波反投影法/优化模型/精度和稳定性/模板设计Key words
CT system calibration/filtered back projection method/optimization model/accuracy and stability/design of templates分类
数理科学引用本文复制引用
李江珊,邹义华,姚竹,王志勇..基于优化的CT系统标定与滤波反投影图像重建[J].实验科学与技术,2019,17(1):12-16,36,6.基金项目
国家自然科学基金(11301058) （11301058）
电子科技大学中央高校基本科研业务项目(ZYGX2015J103). （ZYGX2015J103）
