南方医科大学学报2016，Vol.36Issue(7)：969-973,978,6.DOI:10.3969/j.issn.1673-4254.2016.07.17
基于运动补偿的压缩感知4D-CBCT优质重建
Motion-compensated compressed sensing four-dimensional cone-beam CT reconstruction
摘要
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.关键词
四维锥形束CT/运动补偿/压缩感知Key words
4-dimensional cone beam computed tomography/motion compensation/compressed sensing引用本文复制引用
杨轩,张华,何基,曾栋,张忻宇,边兆英,张敬,马建华..基于运动补偿的压缩感知4D-CBCT优质重建[J].南方医科大学学报,2016,36(7):969-973,978,6.基金项目
国家自然科学基金（81371544，81501466）；广东省自然科学基金（2014A030310243）Supported by National Natural Science Foundation of China (81371544,81501466) （81371544,81501466）
