Composite cone-beam filtered backprojection algorithm based on nutating line  

作　　者：WANG YU OU Zong-ying SU Tie-ming WANG Feng 

机构地区：[1]Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian, Liaoning 116024, China [2]Depart of Interventional Radiology, Dalian Medical University, Dalian 116011, China

出　　处：《Optoelectronics Letters》2006年第3期221-224,共4页光电子快报（英文版）

基　　金：This work was sponsored by Youth Foundation Project of Liaon-ing Province Education Department .(NO.2004F057)

摘　　要：The FDK algorithm is the most popular cone beam algorithm in the medical and industrial imaging field. Due to data insufficiency acquired from a circular trajectory, the images reconstructed by the FDK algorithm suffer from the intensity droping with increasing cone angle. To overcome the drawback,a modified FDK algorithm is presented by convert the 1D ramp filtering direction from along the horizontal lines to along the nutating lines based on the result of Turbell. Unlike Turbell＇s method,there is no need for our algorithm to rebin the cone-beam data into 3D parallel-beam data before reconstructing. Moreover pre-weighting of the projection data is corrected by compensating for the cone angle effect. In addition,another correction term derived from the result of Hu is also induced into our algorithm. The simulation experiments demonstrate that the final algorithm can SUDDress the intensity droD associated with the FDK algorithm.

关 键 词：复合材料 FDK算法 映射 图象重建 

分 类 号：TN957.52[电子电信—信号与信息处理]