title: Extra projection data identification method for fast-continuous-rotation industrial cone-beam CT.
abstract: Fast-continuous-rotation is an effective measure to improve the scanning speed and decrease the radiation dose for cone-beam CT. However, because of acceleration and deceleration of the motor, as well as the response lag of the scanning control terminals to the host PC, uneven-distributed and redundant projections are inevitably created, which seriously decrease the quality of the reconstruction images. In this paper, we first analyzed the aspects of the theoretical sequence chart of the fast-continuous-rotation mode. Then, an optimized sequence chart was proposed by extending the rotation angle span to ensure the effective 2π-span projections were situated in the stable rotation stage. In order to match the rotation angle with the projection image accurately, structure similarity (SSIM) index was used as a control parameter for extraction of the effective projection sequence which was exactly the complete projection data for image reconstruction. The experimental results showed that SSIM based method had a high accuracy of projection view locating and was easy to realize.
authors.affiliation: School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing, China.
authors.forename: Min
authors.initials: M
authors.lastname: Yang
authors.forename: Shengling
authors.initials: S
authors.lastname: Duan
authors.forename: Jinghui
authors.initials: J
authors.lastname: Duan
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Wang
authors.forename: Xingdong
authors.initials: X
authors.lastname: Li
authors.forename: Fanyong
authors.initials: F
authors.lastname: Meng
authors.forename: Jianhai
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000465:Algorithms; D054893:Cone-Beam Computed Tomography / Q000295:instrumentation* / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008962:Models, Theoretical
keywords: Cone-beam CT; data redundancy; fast-continuous-rotation scanning; structural similarity