| 基于R-line算法的锥形束重构区域 |
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| 引用本文： | 李真真,杜明辉. 基于R-line算法的锥形束重构区域[J]. 华南理工大学学报(自然科学版), 2007, 35(5): 25-29,40 |
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| 作者姓名： | 李真真 杜明辉 |
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| 作者单位： | 华南理工大学,电子与信息学院,广东,广州,510640;华南理工大学,电子与信息学院,广东,广州,510640 |
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| 基金项目： | 广东省自然科学基金资助项目(05006593) |
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| 摘 要： | 基于R-line算法,对各种锥形束的源轨道的重构区域作了数学描述,给出了重构区域的定义并分析了重构区域的存在性,解析了正交双圆轨道、螺旋轨道以及鞍形轨道等典型轨道对应的重构区域的剖面特征,并讨论了轨道离散化对重构精度的影响.实验结果表明,重构区域的几何参数对空间中的生成点集有控制作用,轨道离散化后的重构点分布具有聚集性,重构剖面上误差分布不均匀.
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| 关 键 词： | 锥形束重构 重构区域 轨道几何 重构精度 计算机断层成像 |
| 文章编号： | 1000-565X（2007）05-0025-05 |
| 修稿时间： | 2006-05-19 |
Cone-Beam Reconstruction Range Based on R-line Algorithm |
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| Li Zhen-zhen,Du Ming-hui. Cone-Beam Reconstruction Range Based on R-line Algorithm[J]. Journal of South China University of Technology(Natural Science Edition), 2007, 35(5): 25-29,40 |
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| Authors: | Li Zhen-zhen Du Ming-hui |
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| Affiliation: | School of Electronic and Information Engineering, South China Univ. of Tech. , Guangzhou 510640, Guangdong, China |
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| Abstract: | The reconstruction ranges of various cone-beam source trajectories are mathematically described based on the R-line algorithm,and the definition and existence of the reconstruction ranges are studied.Then,the section characteristics of the reconstruction ranges of several typical trajectories such as orthogonal double circles,helix and saddle trajectories are investigated.The effect of trajectory discretization on the reconstruction accuracy is finally discussed.Experimental results show that the sets of reconstructed points are controlled by the geometric parameters of the reconstruction range,and that the reconstructed points after the trajectory discretization non-uniformly distri-bute with an uneven reconstruction error distribution. |
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| Keywords: | cone-beam reconstruction reconstruction range trajectory geometry reconstruction accuracy Computed Tomography |
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