title: Fast Katsevich algorithm based on GPU for helical cone-beam computed tomography.
abstract: Katsevich reconstruction algorithm represents a breakthrough for helical cone-beam computed tomography (CT) reconstruction, because it is the first exact cone-beam reconstruction algorithm of filtered backprojection (FBP) type with 1-D shift-invariant filtering. Although FBP-type reconstruction algorithm is effective, 3-D CT reconstruction is time-consuming, and the accelerations of Katsevich algorithm on CPU or cluster have been widely studied. In this paper, Katsevich algorithm is accelerated by using graphics processing unit, including flat-detector and curved-detector geometry in the case of helical orbit. An overscan formula is derived, which helps to avoid unnecessary overscan in practical CT scanning. Based on the overscan formula, a volume-blocking method in device memory is proposed. One advantage of the blocking method is that it can reconstruct large volume with high speed.
authors.affiliation: Medical Image Processing Group, Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China. yangr@fingerpass.net.cn
authors.forename: Guorui
authors.initials: G
authors.lastname: Yan
authors.forename: Jie
authors.initials: J
authors.lastname: Tian
authors.forename: Shouping
authors.initials: S
authors.lastname: Zhu
authors.forename: Chenghu
authors.initials: C
authors.lastname: Qin
authors.forename: Yakang
authors.initials: Y
authors.lastname: Dai
authors.forename: Fei
authors.initials: F
authors.lastname: Yang
authors.forename: Di
authors.initials: D
authors.lastname: Dong
authors.forename: Ping
authors.initials: P
authors.lastname: Wu
mesh_terms: D000465:Algorithms; D008962:Models, Theoretical; D014054:Tomography / Q000379:methods*