CAJ | 학술논문

利用蒙特卡罗方法得到的数值图像研究高能X射线辐射成像的密度重建,提出多能X射线源、多材料客体辐射成像的密度重建方法.这种方法不仅能够对包括光源能谱、角分布和尺寸在内的密度重建,而且具有显含质量吸收系数的优点.利用约束共轭梯度算法和变分正则化技术进行法国试验客体的密度重建.结果表明,该方法能够有效地进行高能X射线辐射成像的密度重建,成像光子的能谱效应对于精确的密度重建十分重要.
이용몽특잡라방법득도적수치도상연구고능X사선복사성상적밀도중건,제출다능X사선원、다재료객체복사성상적밀도중건방법.저충방법불부능구대포괄광원능보、각분포화척촌재내적밀도중건,이차구유현함질량흡수계수적우점.이용약속공액제도산법화변분정칙화기술진행법국시험객체적밀도중건.결과표명,해방법능구유효지진행고능X사선복사성상적밀도중건,성상광자적능보효응대우정학적밀도중건십분중요.
Numerical radiograph using Monte Carlo method is used to study fidelity of density reconstruction in highenergy X-ray radiography.A density reconstruction method for a polyenergetic X-ray source and an object composed of different materials is proposed.The method includes energy spectrum,angular spectrum and spot size of photon source.And it indudes mass absorption coefficients explicitly in density reconstruction as well.A constrained conjugate gradient algorithm and variation regularization are applied to determine material edges and density reconstruction of a French test object.It shows that the method is valid for density reconstruction and energy spectrum of imaging photons is important in obtaining accurate material densities in high-energy X-my radiography.