| CT图像环形伪迹分析 |
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| 引用本文： | 庞彦伟,王召巴,林敏,岳海霞.CT图像环形伪迹分析[J].中北大学学报,2001,22(1):16-19. |
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| 作者姓名： | 庞彦伟 王召巴 林敏 岳海霞 |
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| 作者单位： | 华北工学院现代无损检测中心!山西太原030051 |
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| 基金项目： | 部级“九五”重点预研项目 |
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| 摘 要： | 目的 探讨探测器响应效率不一致导致重建图像中产生伪迹为环形的过程 ,以及在平行束二维CT、扇束二维 CT中的不同表现 .方法 从 CT图像重建原理入手 ,运用反投影的物理意义 .结果 环形伪迹与射线源旋转角度范围及响应不一致单元在探测器的位置密切相关 .结论 平行束二维 CT产生的伪迹为半环形 ,而扇形束二维 CT产生的伪迹为闭环形 .
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| 关 键 词： | 计算机断层扫描 环形伪迹 图像重建 CT 无损检测 |
| 文章编号： | 1006-5431(2001)01-0016-04 |
| 修稿时间： | 2000年9月5日 |
Analasis of Ring Artifacts of CT Images |
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| PANG Yan-wei.Analasis of Ring Artifacts of CT Images[J].Journal of North University of China,2001,22(1):16-19. |
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| Authors: | PANG Yan-wei |
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| Abstract: | Aim\ To research how the non-uniformity in the response of detector elements causes ring artifacts and their different appearance in parallel-beam 2D CT and in fan-beam CT. Methods\ Based on the principle of image reconstruction and the physical meaning of back-projection,the simulation is used. Results\ The ring artifacts are closely related to the angle range of x-ray source, as well as the position of the odd elements with abnormal response. Conclusion\ Artifacts in parallel-beam CT are actually semi-annualar artifacts while those in fan-beam CT are a series of whole-rings. |
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| Keywords: | computer tomography ring artifacts image reconstruction CT non-destructive tests |
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