| 基于圆扫描轨迹的锥形束CT重建与环形伪影消除 |
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| 引用本文： | 杨俊,甄鑫,卢文婷,周凌宏.基于圆扫描轨迹的锥形束CT重建与环形伪影消除[J].南方医科大学学报,2009,29(12):2379-2382. |
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| 作者姓名： | 杨俊 甄鑫 卢文婷 周凌宏 |
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| 作者单位： | 1. 南方医科大学生物医学医学工程学院,广东,广州,510515;解放军第458医院,广东,广州,510602
2. 南方医科大学生物医学医学工程学院,广东,广州,510515 |
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| 基金项目： | 国家自然科学基金，广东省教育厅学科建设基金，广东省重点科技计划项目 |
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| 摘 要： | FDK算法由于其数学表达简单,实现简单、快速,是目前基于圆扫描轨迹的锥形束CT（Cone-beam CT,CBCT）重建的主流算法。但CBCT采集系统固有的机械误差和在大锥角的情况下,重建图像会引入各种伪影。本文利用体模投影图像、老鼠投影数据和VARIAN23EX医用直线加速器采集的真实人体投影数据对FDK算法进行了验证,并提出了一种快速精确消除重建后图像环形伪影的方法,该方法能精确的定位出环形伪影,并不受环形伪影宽度大小的约束,能最大限度的保全原有图像信息。
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| 关 键 词： | 环形伪影 伪影消除 CT重建 锥形 扫描 医用直线加速器 采集系统 重建图像 |
Cone-beam CT reconstruction based on circular scan trajectory and ring artifact reduction |
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| YANG Jun,ZHEN Xin,LU Wen-ting,ZHOU Ling-hong.Cone-beam CT reconstruction based on circular scan trajectory and ring artifact reduction[J].Journal of Southern Medical University,2009,29(12):2379-2382. |
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| Authors: | YANG Jun ZHEN Xin LU Wen-ting ZHOU Ling-hong |
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| Institution: | YANG Jun1,2,ZHEN Xin1,LU Wen-ting1,ZHOU Ling-hong1 1School of Biomedical Engineering,Southern Medical University,Guangzhou 510515,China,2458 Hospital of PLA,Guangzhou 510602 |
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| Abstract: | The FDK algorithm is one of the most widely used algorithms for cone-beam CT reconstruction in circular trajectory due to its simplicity of implementation and computational efficiency. However, the images reconstructed by the FDK algorithm based on real projection data may be blurred without electronic correction and geometric calibration, and are often plagued by deleterious ring artifacts and shading artifacts. We compared the images reconstructed with and without detector correction based on computer exp... |
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| Keywords: | cone-beam CT FDK algorithm detector correction ring artifacts reduction shading artifacts reduction |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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