基于蒙卡模拟能谱划分的X射线图像硬化校正方法
Beam hardening correction method based on Monte Carlo energy spectrum partitioning for X-ray image
杨柳 1宋勇 2李廷 3俞盛朋3
作者信息
- 1. 安徽大学物质科学与信息技术研究院,安徽合肥 230601
- 2. 中国科学院合肥物质科学研究院,安徽合肥 230031;中子科学国际研究院,山东青岛 266199
- 3. 中子科学国际研究院,山东青岛 266199;中科超精(南京)科技有限公司,江苏南京 210044;中科超精(安徽)先进技术研究院有限公司,安徽合肥 230088
- 折叠
摘要
目的:验证基于蒙卡模拟能谱划分的X射线图像硬化校正方法的可行性和有效性.方法:基于蒙卡模拟能谱划分的X射线图像硬化校正方法,通过蒙卡模拟创建多能射线能谱和单能射线能量沉积硬化校正数据库,根据能谱划分步长和特定能谱分布的射线适配硬化校正数据库快速计算多能投影数据,然后将多能投影数据与被检测物体的射线贯穿长度进行多项式拟合,实现X射线图像的硬化校正参数的拟合.结果:该方法硬化校正后的X射线图像的HU值曲线更加平坦,在管电压120 kV时10 keV划分步长条件下,X射线图像均匀性提升29.40%.与传统蒙卡硬化校正方法相比,有效提升硬化校正参数的拟合效率.结论:基于蒙卡模拟能谱划分的X射线图像硬化校正方法是可行有效的.
Abstract
Objective To verify the feasibility and effectiveness of the beam hardening correction method based on Monte Carlo simulation and energy spectrum partitioning for X-ray image.Methods A beam hardening correction method based on Monte Carlo simulation and energy spectrum partitioning for X-ray image was presented.The Monte Carlo simulation results of multi-energy X-ray spectra and single-energy X-ray energy deposition were saved as a hardening correction database.The rapid calculation of the multi-energy projection data was achieved by adapting the hardening correction database based on the step size of energy spectrum partitioning and specific energy spectrum distribution of the rays.Subsequently,a polynomial fitting was performed on the multi-energy projection data and the penetration lengths of the rays through the detected object,thus realizing the fitting of hardening correction parameters for X-ray image.Results The HU value curve of the X-ray image after beam hardening correction by the proposed method was flatter.Under the condition of a tube voltage of 120 kV and a step size of 10 keV,the uniformity of the X-ray image was improved by 29.40%.Compared with the traditional Monte Carlo beam hardening correction method,the proposed method effectively improved the efficiency of the beam hardening correction parameter fitting.Conclusion The proposed beam hardening correction method based on Monte Carlo simulation and energy spectrum partitioning for X-ray image is feasible and effective.
关键词
硬化伪影/多项式拟合/蒙卡模拟/能谱划分/硬化校正数据库Key words
hardening artifact/polynomial fitting/Monte Carlo simulation/spectrum partitioning/hardening correction database引用本文复制引用
出版年
2024
NETL
NSTL
万方数据