光子学报, 2005, 34 (3): 434, 网络出版: 2006-06-12
有效线吸收系数能谱效应综合法研究
Research on Efficient Linear Attenuation Coefficient(ELAC)of Spectrum Effect with Combined Method
摘要
利用综合法(照射量传递函数法、剥层法和MC数值模拟法)研究了闪光照相中法国实验客体FTO(French Test Object)中各种材料的有效线吸收系数.结果表明:在照相过程中,随着X光穿透的加深,其能谱不断地向材料最小质量吸收系数对应的能量值演变并窄化.在这样的能谱效应下,有效线吸收系数随着穿透材料厚度的加深而减小.铜的平均有效线吸收系数为0.299(1±3.0%)cm-1,钨的平均有效线吸收系数为0.829(1±2.7%)cm-1.在图像重建中,利用上述的有效线吸收系数能够得到高精度的材料密度分??
Abstract
The ELACs of all kinds of components in the FTO (French Test Object) are investigated. And the combined method ( exposure transmission function , peeling onion,and Monte Carlo method ) is used. Many excited results have been worked out. The spectrum is translating and narrowing to the value which is according to the minimal mass attenuation coefficient of the element in the radiography. Because of which, the ELAC decreases while the X-ray goes deeper in the mass. The average efficient linear attenuation coefficient of copper is 0.299(1±3.0%)cm~-1 , while tungsten 0.829(1±2.7%)cm~-1 .With which the high precision density contribution of the components can be got in the reconstruction.
刘进, 刘军, 李必勇, 施将君. 有效线吸收系数能谱效应综合法研究[J]. 光子学报, 2005, 34(3): 434. 刘进, 刘军, 李必勇, 施将君. Research on Efficient Linear Attenuation Coefficient(ELAC)of Spectrum Effect with Combined Method[J]. ACTA PHOTONICA SINICA, 2005, 34(3): 434.
PDF全文
