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基于斜孔散射校正板的锥束X射线CT散射校正方法

郭成龙 倪培君 齐子诚 付康

郭成龙, 倪培君, 齐子诚, 等. 基于斜孔散射校正板的锥束X射线CT散射校正方法[J]. 强激光与粒子束, 2024, 36: 074004. doi: 10.11884/HPLPB202436.230362
引用本文: 郭成龙, 倪培君, 齐子诚, 等. 基于斜孔散射校正板的锥束X射线CT散射校正方法[J]. 强激光与粒子束, 2024, 36: 074004. doi: 10.11884/HPLPB202436.230362
Guo Chenglong, Ni Peijun, Qi Zicheng, et al. Scattering correction method for cone-beam X-ray CT based on slanted-hole scattering correction plate[J]. High Power Laser and Particle Beams, 2024, 36: 074004. doi: 10.11884/HPLPB202436.230362
Citation: Guo Chenglong, Ni Peijun, Qi Zicheng, et al. Scattering correction method for cone-beam X-ray CT based on slanted-hole scattering correction plate[J]. High Power Laser and Particle Beams, 2024, 36: 074004. doi: 10.11884/HPLPB202436.230362

基于斜孔散射校正板的锥束X射线CT散射校正方法

doi: 10.11884/HPLPB202436.230362
基金项目: 国家重点研发计划项目(2022YFB602500);国家高技术发展计划项目
详细信息
    作者简介:

    郭成龙,1065337899@qq.com

    通讯作者:

    倪培君,nipeijun@vip.sina.com

  • 中图分类号: TP391.41

Scattering correction method for cone-beam X-ray CT based on slanted-hole scattering correction plate

  • 摘要: 锥束X射线CT和二维扇束、平行束CT系统相比具有扫描速度快、射线利用率高、重建图像轴向分辨率和水平分辨率一致等优点,是当前工业CT技术发展的重点。然而,由于散射线的存在,其成像质量受到影响。为了减小散射线对图像质量的影响,提出一种新的基于斜孔散射校正板的散射校正方法,对该方法的原理和实现进行了深入的研究,通过获取原始扫描数据以及斜孔散射校正板后的扫描数据,利用插值和平滑处理的方法获得散射场数据。然后,通过将原始数据减去散射场数据后进行重建,即可得到无散射的CT图像。通过与光栅式散射校正板校正方法进行对比,结果表明,该方法应用于涡轮叶片的锥束CT扫描结果校正,典型区域(叶片内冷却通道及叶片内壁)对比度噪声比分别提升了14.2%和56.8%,而光栅式散射校正板校正后,同一位置对比度噪声比分别仅提升了5.6%和27.6%,验证了基于斜孔散射校正板散射校正方法的优越性。
  • 图  1  针对锥束CT的成像系统几何图形的说明

    Figure  1.  Illustration of imaging system geometry for cone-beam X-ray (CBCT) CT

    图  2  散射校正步骤示意图

    Figure  2.  Scatter correction procedure diagram

    图  3  校正板投影信息

    Figure  3.  Projection information of the correction plate

    图  4  插值过程示意图

    Figure  4.  Interpolation process schematic diagram

    图  5  图像处理流程图

    Figure  5.  Flow chart of image processing

    图  6  CT系统外观

    Figure  6.  Appearance of the CT

    图  7  CT散射估计

    Figure  7.  CT scattering estimation

    图  8  沿A1A2的灰度值图像

    Figure  8.  Gray value images along A1 and A2

    图  9  沿A2方向两幅DR图像校正前后的灰度值图像

    Figure  9.  Grayscale images of two DR images along A2 direction

    图  10  重建后图像

    Figure  10.  Reconstructed images

    图  11  校正前后切片图

    Figure  11.  Tomographic images before and after correction

    表  1  校正板几何参数

    Table  1.   Correction plate geometry parameters

    width of calibration
    plate/mm
    calibration plate
    height/mm
    calibration plate
    thickness/mm
    hole
    diameter/mm
    vertical hole
    spacing/mm
    horizontal hole
    spacing/mm
    400 400 20 4 9.2 5.3
    下载: 导出CSV

    表  2  扫描参数

    Table  2.   Scanning parameters

    scanning voltage/kV scanning current/μA focus size/mm image size/(pixel×pixel) FOD/mm FDD/mm
    260 180 0.4 2000×2000 149 807
    下载: 导出CSV

    表  3  校正前后切片图像对比度噪声比

    Table  3.   RCN of tomographic images before and after correction

    correction method origin RCN RCN improvement ratio/%
    area a area b area a area b
    pre-correction 30.3 7 / /
    after slanted-hole correction 35.3 16.2 14.2 56.8
    after raster correction 32.1 9.7 5.6 27.6
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-10-20
  • 修回日期:  2024-04-12
  • 录用日期:  2024-04-02
  • 网络出版日期:  2024-04-28
  • 刊出日期:  2024-05-31

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