Fast parallel algorithm for three-dimensional distance-driven model in iterative computed tomography reconstruction*
Chen Jian-Lin, Li Lei, Wang Lin-Yuan, Cai Ai-Long, Xi Xiao-Qi, Zhang Han-Ming, Li Jian-Xin, Yan Bin†
       
Four projective mappings B left, B bottom, B right, and B top of the coordinates of the current voxel project on the detector corresponding to four varying variables b l, b b, b r, and b t.