Gray weighted algorithm for variable voltage CT reconstruction  

变电压CT重建的灰度加权算法(英文)

作　　者：李权[1] 陈平[1,2] 潘晋孝[1] 

机构地区：[1]中北大学信息探测与处理山西省重点实验室,山西太原030051 [2]中国科学院自动化研究所中国科学院分子影像重点实验室,北京100190

出　　处：《Journal of Measurement Science and Instrumentation》2014年第4期52-56,共5页测试科学与仪器（英文版）

摘　　要：In conventional computed tomography （CT） reconstruction based on fixed voltage, the projective data often ap- pear overexposed or underexposed, as a result, the reconstructive results are poor. To solve this problem, variable voltage CT reconstruction has been proposed. The effective projective sequences of a structural component are obtained through the variable voltage. The total variation is adjusted and minimized to optimize the reconstructive results on the basis of iterative image using algebraic reconstruction technique （ART）. In the process of reconstruction, the reconstructive image of low voltage is used as an initial value of the effective proiective reconstruction of the adjacent high voltage, and so on until to the highest voltage according to the gray weighted algorithm. Thereby the complete structural information is reconstructed. Simulation results show that the proposed algorithm can completely reflect the information of a complicated structural com- ponent, and the pixel values are more stable than those of the conventional.

关 键 词：variable voltage computed tomography （CT） reconstruction total variation-algebraic reconstruction technique （TV-ART） algorithm gray weight effective projection 

分 类 号：TM41[电气工程—电器] TP391.41[自动化与计算机技术—计算机应用技术]