两种基于投影数据恢复的低剂量CT重建方法比较  

Comparison of Two Projection Restoration Based Low-dose CT Reconstruction Methods

作　　者：钱姗姗[1] 边兆英[2] 路利军[2] 马建华[2] 

机构地区：[1]广东农工商职业技术学院计算机系,广东广州510507 [2]南方医科大学生物医学工程学院医学信息研究所,广东广州510515

出　　处：《广东农工商职业技术学院学报》2013年第1期52-55,共4页Journal of Guangdong Agriculture Industry Business Polytechnic

摘　　要：目的:低剂量CT重建已成为CT成像的研究热点,针对低剂量CT成像,文章对两种基于投影数据恢复的低剂量CT重建方法进行了讨论比较。材料与方法:这两种方法分别为基于投影数据非单调性全变分最小恢复的低剂量CT重建方法和基于投影数据惩罚加权最小二乘恢复的低剂量CT重建方法。我们通过数字体模仿真实验对两种方法分别进行了定性和定量比较分析。结果:实验结果表明,两种方法均能有效去除噪声、抑制伪影、提高低剂量CT重建图像质量。结论:重建时间方面,基于投影数据非单调性全变分最小恢复的低剂量CT重建方法更有优势。Purpose ： Low-dose CT reconstruction has become the focus of CT imaging study. For low-dose CT imaging, two projection restoration based low-dose CT reconstruction methods were compared in this paper. Materials and methods： These two reconstruction methods are based on projection restoration with non-monotone total variation minimization and penalized weighted least-squares, respectively. Simulated digital phantom experiments were conducted to compare these two methods qualitatively and quantitatively. Results： The results demonstrate that these two reconstruction methods can achieve a good performance in noise reduction and artifacts suppression. Conclusion： The method based on projection restoration with non -monotone total variation minimization performs well in terms of reconstruction time.

关 键 词：低剂量CT 非单调性全变分 惩罚加权最小二乘 投影数据恢复 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]