| 扇束CT重建图像的几何伪影分析 |
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| 引用本文： | 王亮,赵云松,张朋.扇束CT重建图像的几何伪影分析[J].无损检测,2011(11):4-9. |
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| 作者姓名： | 王亮 赵云松 张朋 |
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| 作者单位： | 首都师范大学检测成像工程中心;中国电子信息产业发展研究院;赛迪顾问股份公司 |
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| 基金项目： | 国家自然科学基金资助项目(60971131);北京市高层次人才资助项目(RHR20110509) |
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| 摘 要： | 实际工业CT系统在机械安装时很难满足经典CT图像重建公式所要求的几何对准关系。当不满足该几何对准关系时，利用经典CT重建公式重建的图像将出现几何伪影，从而影响对CT图像的判读。针对扇束CT扫描系统，研究了几何参数误差对一根细丝断层图像的影响，导出了描述细丝断层图像伪影形态的包络线方程，并基于包络线给出了几何伪影的形态分类、演化规律和性质，同时给出了几何参数误差的调整方法。
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| 关 键 词： | 扇柬CT 图像重建 参数误差 伪影分析 |
Analysis of Geometric Artifacts for Fan-Beam CT |
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| WANG Liang,ZHAO Yun-Song,ZHANG Peng.Analysis of Geometric Artifacts for Fan-Beam CT[J].Nondestructive Testing,2011(11):4-9. |
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| Authors: | WANG Liang ZHAO Yun-Song ZHANG Peng |
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| Affiliation: | 1 (1.Engineering Research Center of Computed Tomography,Capital Normal University,Beijing 100048,China; 2.CCID Consulting Co Ltd,China Center for Information Industry Development,Beijing 100048,China) |
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| Abstract: | It is very difficult to modulate a real industrial CT system to satisfy the geometric alignment relations required by the conventional CT image reconstruction formula.A misalignment will result in geometric artifacts in the image reconstructed by the conventional formula,which may cause a misjudgment.In this paper,we study the impact of geometric parameters errors for fan-beam system on the reconstructed images of a thin wire.We derive the envelope function which describes geometric artifact configuration in the image.Based on the envelope function,we give a classification,the evolution regularity and the characteristics of geometric artifacts.Besides,we give a method to adjust the errors of geometric parameters. |
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| Keywords: | Fan-beam CT Image Reconstruction Parameters error Artifacts analysis |
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