| 倒置结构锥形束计算机层析的精确成像与Grangeat算法实现 |
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| 引用本文： | 吕东辉,王朔中,庄天戈.倒置结构锥形束计算机层析的精确成像与Grangeat算法实现[J].光学学报,2002,22(10):187-1194. |
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| 作者姓名： | 吕东辉 王朔中 庄天戈 |
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| 作者单位： | 1. 上海大学通信与信息工程学院,上海,200072
2. 上海交通大学生物医学工程系,上海,200030 |
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| 基金项目： | 国家自然科学基金 (39870 2 10 )，上海市高等学校发展科学基金资助课题 |
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| 摘 要： | 研究了一种新的圆加垂直单弧段的锥顶轨迹的锥形束计算机层析（CT）的完全性条件和精确重建的Grangeat方法，提出了倒置结构锥形束计算机层析的便于实现的圆加垂直多弧段的成像结构及进行精确重建的完全性条件。利用倒置成像结构与现有成像结构之间的等价关系，给出了倒置结构锥形束计算机层析的重建算法。最后，对上述几方面进行了计算机模拟。
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| 关 键 词： | 精确成像 Grangeat算法 倒置结构 锥形束计算机层析 无损检测 |
| 收稿时间： | 2001/6/22 |
Implementation of Grangeat Algorithm for Cone Beam Computerized Tomography Based on Reverse Geometry |
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| Lu Donghui Wang Shuozhong Zhuang Tiange ,School of Communacation and Information Engineering,Shanghai University,Shanghai.Implementation of Grangeat Algorithm for Cone Beam Computerized Tomography Based on Reverse Geometry[J].Acta Optica Sinica,2002,22(10):187-1194. |
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| Authors: | Lu Donghui Wang Shuozhong Zhuang Tiange School of Communacation and Information Engineering Shanghai University Shanghai |
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| Institution: | Lu Donghui 1) Wang Shuozhong 1) Zhuang Tiange 2) 1),School of Communacation and Information Engineering,Shanghai University,Shanghai 200072 2),Department of Biomedical Engineering,Shanghai Jiaotong University,Shanghai 200030 |
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| Abstract: | Compared to existing cone beam computerized tomography (CT) techniques, the reverse geometry based cone beam CT (RGCBCT) can provide projection data with considerably higher SNR, and is convenient in the implementation of exact reconstruction. A novel orthogonal circle and arc orbit for cone beam CT is proposed. Its completeness condition and the application of the Grangeat method are discussed. A flexible orthogonal circle and arcs orbit for RGCBCT together with its completeness condition is proposed. Based on the equivalence between the reverse and traditional imaging geometries, a reconstruction algorithm for RGCBCT and computer simulation results are presented. |
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| Keywords: | reverse geometry cone beam computerized tomography non destruction evaluation |
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