title: [Motion-compensated compressed sensing four-dimensional cone-beam CT reconstruction].
abstract: Restriction by hardware caused the very low projection number at a single phase for 4-dimensional cone beam (4D-CBCT) CT imaging, and reconstruction using conventional reconstruction algorithms is thus constrained by serious streak artifacts and noises. To address this problem, we propose an approach to reconstructing 4D-CBCT images with multi-phase projections based on the assumption that the image at one phase can be viewed as the motion-compensated image at another phase. Specifically, we formulated a cost function using multi-phase projections to construct the fidelity term and the TV regularization method. For fidelity term construction, the projection data of the current phase and those at other phases were jointly used by reformulating the imaging model. The Gradient-Projection-Barzilai-Line search (GPBL) method was used to optimize the complex cost function. Physical phantom and patient data results showed that the proposed approach could effectively reduce the noise and artifacts, and the introduction of additional temporal correlation did not introduce new artifacts or motion blur.
authors.affiliation: Department of Medical Imaging, General Hospital Affiliated to Tianjin Medical University, Tianjin 300070, China.E-mail: libingshuihe@126.com.
authors.forename: Xuan
authors.initials: X
authors.lastname: Yang
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Ji
authors.initials: J
authors.lastname: He
authors.forename: Dong
authors.initials: D
authors.lastname: Zeng
authors.forename: Xin-Yu
authors.initials: XY
authors.lastname: Zhang
authors.forename: Zhao-Ying
authors.initials: ZY
authors.lastname: Bian
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Ma
mesh_terms: D000465:Algorithms; D016477:Artifacts; D054893:Cone-Beam Computed Tomography; D056973:Four-Dimensional Computed Tomography; D008962:Models, Theoretical; D009038:Motion; D019047:Phantoms, Imaging