| 锥束CT的分区短扫描FDK重建算法 |
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| 引用本文： | 陈炼,吴志芳,王钦娅.锥束CT的分区短扫描FDK重建算法[J].清华大学学报(自然科学版),2009(6). |
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| 作者姓名： | 陈炼 吴志芳 王钦娅 |
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| 作者单位： | 清华大学核能与新能源技术研究院;重庆机场集团有限公司网络通信公司; |
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| 摘 要： | 圆轨道锥束CT(computed tomography)重建中,随着锥角增大,锥角伪影和数据缺失伪影越来越严重,影响FDK算法(由Feldkamp-Davis-Kress名字命名)重建区域的大小和图像质量。本文分析了短扫描FDK算法(short scanFDK,SS-FDK)重建时的数据完整性,提出了根据重建切片高度自适应地将重建切片分成若干区域,对每个区域采用SS-FDK算法进行重建的分区短扫描FDK重建算法。理论分析及试验仿真表明,该方法虽然计算复杂度有所增加,但充分利用了锥束CT投影数据,较大地增大了重建区域,完全重建区域高度达到扫描高度的1-sin2δ倍(δ为射线源半张角),且重建精度和图像质量与FDK算法相当。
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| 关 键 词： | 锥束CT 数据完整性 重建区域 FDK算法 |
Segmentation short scan FDK reconstruction algorithm for cone-beam CT |
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| CHEN Lian,WU Zhifang,WANG Qinya.Segmentation short scan FDK reconstruction algorithm for cone-beam CT[J].Journal of Tsinghua University(Science and Technology),2009(6). |
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| Authors: | CHEN Lian WU Zhifang WANG Qinya |
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| Institution: | 1.Institute of Nuclear and New Energy Technology;Tsinghua University;Beijing 100084;China;2.Network Communication Company;Chongqing Airport Group;Chongqing 400063;China |
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| Abstract: | The data loss and cone-beam angle artifacts increase with cone angle in circular trajectory cone-beam computed tomography(CT).This limits the reconstruction coverage and image quality of the FDK(Feldkamp-Davis-Kress) algorithm.This paper analyzed the data completeness of the short scan FDK(SS-FDK) algorithm and presented a segmentation short scan FDK reconstruction algorithm.In the algorithm,the reconstruction slice was adaptively divided into several sub-regions according to the slice height and then the S... |
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| 本文献已被 CNKI 等数据库收录！ |
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