电子学报Issue(4)：666-671,6.DOI:10.3969/j.issn.0372-2112.2014.04.007
双能谱CT的迭代重建模型及重建方法
Iterative Reconstruction Model and Reconstruction Method for Dual Energy Computed Tomography
摘要
Abstract
Dual energy computed tomography (DECT) is used to reconstruct energy-selective images ,images of the electron density and the effective atomic number ,or material-selective images of the scanned object .Compared with traditional CT ,DECT has a better material distinguishability .The substantial difficulty for DECT image reconstruction is its nonlinearity .This paper pro-poses a Newton type iterative reconstruction method for DECT .The main feature of the proposed method is its flexibility .It fits for many commonly used scanning configurations and does not require geometrically consistent rays for different spectra .It is also valid for multiple energy CT and slow kVp switching CT .The method is verified with simulated data .Numerical results show that the proposed method can reconstruct the two basis material images correctly .Besides ,as a side-effect ,the beam hardening artifacts in the reconstructed images are reduced significantly .关键词
双能谱CT/迭代重建/基材料分解/SART重建Key words
dual energy computed tomography/iterative reconstruction/basis material decomposition/SART reconstruction分类
信息技术与安全科学引用本文复制引用
赵云松,张慧滔,赵星,张朋..双能谱CT的迭代重建模型及重建方法[J].电子学报,2014,(4):666-671,6.基金项目
国家自然科学基金（No ．60972140，No ．60971131，No ．61127003，No ．61101214）；北京市自然科学基金 （）
