Influence of cone beam CT process parameters on imaging quality
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摘要: 影响锥束CT成像质量的工艺参数较多，通过研究关键工艺参数对CT图像质量的影响规律，可获得更好的锥束CT成像效果。基于德国卡尔蔡司公司的METROMTOM 1500型微焦点锥束CT系统，研究了管电压、管电流、焦点尺寸、试样的几何位置、投影数量、积分时间、Binning模式等关键工艺参数对CT图像质量的影响。结果表明，在管电压足够的情况下调整管电压和管电流，将焦点尺寸和体素尺寸控制在接近时获得的图像清晰度最好；减小被测物体与射线源的距离，能够明显提高图像清晰度；增加投影数量可以明显减少干扰噪声；高Binning模式能够提高图像的细节分辨率；积分时间对图像的质量影响不明显。Abstract: There are many technological parameters that affect the image quality of cone-beam CT, so it is necessary to systematically study the influence of each technological parameter on the image quality of CT, so as to obtain better cone beam CT imaging effect. In this paper, the effects of process parameters such as tube voltage and tube current, focus size, sample geometry, projection number, integration time and binning mode on CT image of the METROMTOM 1500 microfocus cone-beam CT system of German Carl Zeiss were investigated in detail. The results demonstrate that the best image resolution can be obtained when the tube voltage and tube current can be adjusted to enable the focal size and voxel size to be close to each other under the condition of sufficient tube voltage. Meanwhile, the image clarity can be significantly improved by reducing the source-to-object distance, the interference noise can be significantly reduced by increasing the number of projections, and the image detail resolution can be increased by high binning mode. In addition, the impact of integration time on image quality is not obvious.
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Keywords:
- cone-beam CT /
- process parameter /
- image quality /
- influence
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[1] 罗刚, 施养抗. 钢筋混凝土构件中钢筋锈蚀量的无损检测方法[J]. 福建建筑, 2002(4):55-57. [2] 牛荻涛. 混凝土结构耐久性与寿命预测[M]. 北京:科学出版社, 2003. [3] 张维国, 倪培君, 王晓艳, 等.工业CT检测中主要工艺参数定量取值方法[J].无损检测, 2017, 39(12):7-9, 14. [4] 张定华, 黄魁东, 程云勇. 锥束CT技术及其应用[M]. 西安:西北工业大学出版社, 2010. [5] 肖永顺, 陈志强, 张丽. 工业CT断层图像缺陷检测的可视化方法研究[J]. 仪器仪表学报, 2002, 23(S2):647-649. [6] 吴东流. 复合材料CT检测的原理和应用[J]. 宇航材料工艺, 2001, 31(1):42-48. [7] 李时光, 先武. 工业CT技术第四讲工业CT图象重建原理[J]. 无损检测, 1996, 18(4):111-115. [8] 周江, 孙灵霞, 叶云长. 工业CT工艺参数选择对图像质量的影响[J]. 核电子学与探测技术, 2009, 29(5):1183-1188. [9] 潘小东, 张催, 商宏杰, 等. 锥束CT成像质量影响因素研究[J]. 原子核物理评论, 2019, 36(2):211-217.
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