DSA cone beam reconstruction algorithm based on backprojection weight FDK
1.Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin 130000, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3.Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, China
Abstract：Abstract: To solve the problem of cone beam artifacts resulting from the large cone angle in cone beam digital subtraction angiography of DSA, a novel backprojection weight reconstruction algorithm based on the frame work of FDK(BPWFDK) was proposed. The cause of the cone beam artifacts away from the rotating track was analyzed. To solve the data deficiency in Randon space, a new backprojection weight function based on distance was designed and incorporated into the original FDK algorithm as a constraint condition for data compensation in the region far away from the rotating track to expand the reconstruction region. The reconstructing experiments were conducted on the images from simulated projections with noise or without noise and the real projections from a selfdevelopment DSA scanner. The results show that the proposed algorithm has obvious superiority over the ParkerFDK algorithm in suppression of cone beam artifacts for large cone angle projections. Compared with the ParkerFDK, the normalized mean square distance criterion and the normalized mean absolute distance criterion of the proposed algorithm are decreased by 5%.
2013, Vol. 34 
