摘要
本文用 Monte Carlo方法模拟了 X射线与转换屏作用产生的可见光子在无晶柱和理想晶柱转换屏中的传输过程 ,给出了可见光子在转换屏中的点扩展函数 ,并计算了其 MTF.结果表明 ,晶柱结构的转换屏能有效地改善转换屏的空间分辨特性 .同时 ,本文还给出了转换屏的转换效率及传输效率与球管电压。
The transfer properties of light photons generated by X rays in scintillation layer with free columns and with ideal columns were simulated by Monte Carlo method.Based on the computation of point spread functions of light photons in scintillation layer,the MTF curves were also figured out.The results show that the resolving power of scintillation layer can be greatly improved by the structure of columns.In addition,the simulated results of the dependences of the conversion and the transmission efficiencies on the X ray tube potential and the thickness of CsI∶Na layer suggest that there is a tradeoff between increasing thickness of CsI∶Na layer and improving the transmission efficiency.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2001年第7期801-806,共6页
Acta Photonica Sinica
基金
国家自然科学基金资助项目 ( 6 95480 0 2 )
