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集装箱CT检查系统二维防散射滤线栅作用分析

邹伟 朱国平 凌云龙 宗春光 刘必成 易茜 张一鸣 邓艳丽 李君利

邹伟, 朱国平, 凌云龙, 等. 集装箱CT检查系统二维防散射滤线栅作用分析[J]. 强激光与粒子束, 2023, 35: 086001. doi: 10.11884/HPLPB202335.220421
引用本文: 邹伟, 朱国平, 凌云龙, 等. 集装箱CT检查系统二维防散射滤线栅作用分析[J]. 强激光与粒子束, 2023, 35: 086001. doi: 10.11884/HPLPB202335.220421
Zou Wei, Zhu Guoping, Ling Yunlong, et al. A simulation study of two-dimensional anti-scatter grid in container CT inspection system[J]. High Power Laser and Particle Beams, 2023, 35: 086001. doi: 10.11884/HPLPB202335.220421
Citation: Zou Wei, Zhu Guoping, Ling Yunlong, et al. A simulation study of two-dimensional anti-scatter grid in container CT inspection system[J]. High Power Laser and Particle Beams, 2023, 35: 086001. doi: 10.11884/HPLPB202335.220421

集装箱CT检查系统二维防散射滤线栅作用分析

doi: 10.11884/HPLPB202335.220421
详细信息
    作者简介:

    邹 伟,zouwei@nuctech.com

    通讯作者:

    李君利,lijunli@tsinghua.edu.cn

  • 中图分类号: TL99

A simulation study of two-dimensional anti-scatter grid in container CT inspection system

  • 摘要: 基于辐射成像系统蒙卡模拟软件NucRPD,对一款以9 MeV加速器作为辐射源的集装箱CT检查系统进行全系统蒙卡模拟,并使用目标晶体笔标记法、散射部件标记法与断层图像计算法综合分析了位于探测器晶体前方的二维防散射滤线栅对散射X射线的压低作用。计算结果表明此款集装箱CT检查系统中二维防散射滤线栅对于降低散射X射线的作用有限,后续在工程应用中无需使用二维防散射滤线栅,这将极大降低后端集装箱CT检查系统探测器与旋转机架等部件的机械设计难度与工程实现成本。
  • 图  1  集装箱CT检查系统布置图

    Figure  1.  Container CT inspection system scheme

    图  2  加速器结构图

    Figure  2.  Accelerator structure scheme

    图  3  探测器多排晶体布置图

    Figure  3.  Detector multi-column crystal layout

    图  4  钨隔片结构图

    Figure  4.  Tungsten spacer scheme

    图  5  集装箱CT检查系统几何模型图

    Figure  5.  Geometric model of container CT inspection system

    图  6  二维防散射滤线栅几何模型图

    Figure  6.  Two-dimensional anti-scatter grid geometric model

    图  7  轫致辐射X射线能谱分布图

    Figure  7.  X-ray energy distribution

    图  8  CT系统测试模体几何模型图

    Figure  8.  CT test phantom geometric model

    图  9  探测器晶体能量沉积分布图

    Figure  9.  Distribution of crystal energy deposition

    图  10  CWO晶体测试模体扫描正弦图

    Figure  10.  CWO crystal test phantom scan sinograms

    图  11  BGO晶体测试模体扫描正弦图

    Figure  11.  BGO crystal test phantom scan sinograms

    图  12  CWO晶体测试模体断层重建图

    Figure  12.  CWO crystal test phantom CT reconstruction image

    图  13  BGO晶体测试模体断层重建图

    Figure  13.  BGO crystal test phantom CT reconstruction image

    表  1  散射部件能量沉积比例计算结果

    Table  1.   Scattered component energy deposition ratio result

    componentenergy deposition ratio without 2D ASG/%energy deposition ratio with 2D ASG/%difference of with - without 2D ASG/%
    CWOBGOCWOBGOCWOBGO
    signal
    X-ray
    crystals 52.95±0.06 54.60±0.04 53.72±0.06 55.29±0.04 0.77±0.08 0.69±0.06
    scattered
    X-ray
    reflector 3.28±0.01 1.68±0.01 3.23±0.01 1.66±0.01 −0.05±0.01 −0.02±0.01
    tungsten spacer 15.29±0.03 13.65±0.02 13.19±0.02 12.13±0.01 −2.10±0.04 −1.52±0.02
    cushion 0.01±0.01 0.01±0.01 0.01±0.01 0.01±0.01 0.00±0.01 0.00±0.01
    other rows 13.62±0.02 16.41±0.02 14.53±0.02 17.21±0.02 0.91±0.03 0.80±0.03
    PCB board 0.26±0.01 0.31±0.01 0.27±0.01 0.31±0.01 0.01±0.01 0.00±0.01
    base 0.11±0.01 0.26±0.01 0.11±0.01 0.26±0.01 0.00±0.01 0.00±0.01
    appearance
    box
    1.19±0.01 1.36±0.01 1.04±0.01 1.31±0.01 −0.15±0.01 −0.05±0.01
    others 13.29±0.02 11.72±0.01 13.90±0.02 11.82±0.01 0.61±0.03 −0.10±0.01
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-12-22
  • 修回日期:  2023-04-27
  • 录用日期:  2023-03-28
  • 网络出版日期:  2023-05-15
  • 刊出日期:  2023-08-15

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