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瞬发伽马活化成像的数学模型建立与模拟重建

马玉华 李航 杨鑫 李润东 黄洪文

马玉华, 李航, 杨鑫, 等. 瞬发伽马活化成像的数学模型建立与模拟重建[J]. 强激光与粒子束, 2022, 34: 056004. doi: 10.11884/HPLPB202234.210551
引用本文: 马玉华, 李航, 杨鑫, 等. 瞬发伽马活化成像的数学模型建立与模拟重建[J]. 强激光与粒子束, 2022, 34: 056004. doi: 10.11884/HPLPB202234.210551
Ma Yuhua, Li Hang, Yang Xin, et al. Mathematical model establishment, simulation and reconstruction of PGAI[J]. High Power Laser and Particle Beams, 2022, 34: 056004. doi: 10.11884/HPLPB202234.210551
Citation: Ma Yuhua, Li Hang, Yang Xin, et al. Mathematical model establishment, simulation and reconstruction of PGAI[J]. High Power Laser and Particle Beams, 2022, 34: 056004. doi: 10.11884/HPLPB202234.210551

瞬发伽马活化成像的数学模型建立与模拟重建

doi: 10.11884/HPLPB202234.210551
基金项目: 国家自然科学基金联合基金重点项目(U20B2011);国家自然科学基金项目(51978218);四川省科技计划项目(2019ZZDZX0010);国家自然科学基金项目(12075217)
详细信息
    作者简介:

    马玉华,mayuhuaw2016@foxmail.com

    通讯作者:

    杨 鑫,yangx05@126.com

  • 中图分类号: TL99

Mathematical model establishment, simulation and reconstruction of PGAI

  • 摘要: 瞬发伽马活化成像中,样品内部的中子自屏蔽和伽马自吸收效应会使测量结果产生不均匀分布。针对成像单元响应不一致的问题,研究了样品内部中子场不均匀分布和伽马自吸收效应的影响,并进行了理论推导,建立了用于修正成像单元响应和图像重建的数学模型,利用数学模型对Fe,H元素瞬发伽马活化成像的蒙特卡罗模拟进行了元素图像重建。 结果显示,样品内中子场和γ自吸收对成像的影响得到明显改善,Fe和H元素的含量分布使用此模型可以被精确重建,验证了数学模型的有效性。
  • 图  1  实验原理示意图

    Figure  1.  Diagram of experimental principle

    图  2  样品网格单元的位置标号方式

    Figure  2.  Labeling method of the sample grid cell

    图  3  样品各个区域的几何设置

    Figure  3.  Geometric settings of each area in the sample

    图  4  Fe元素瞬发伽马射线计数在样品不同位置的分布图

    Figure  4.  Prompt gamma ray counting distribution of Fe in different positions of the sample

    图  5  H元素瞬发伽马射线计数在样品不同位置的分布图

    Figure  5.  Prompt gamma ray counting distribution of H in different positions of the sample

    图  6  PGAI重建Fe元素的结果

    Figure  6.  PGAI reconstruction result for Fe

    图  7  PGAI重建H元素的结果

    Figure  7.  PGAI reconstruction result for H

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出版历程
  • 收稿日期:  2021-12-08
  • 修回日期:  2022-01-27
  • 录用日期:  2022-02-21
  • 网络出版日期:  2022-02-26
  • 刊出日期:  2022-05-15

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