闪烁体型γ射线-荧光图像转换屏点扩散函数理论研究  

Research on the PSF of Scintillators asγ/fluorescence Image Converters

作　　者：马继明[1,2] 王奎禄[2] 宋顾周[2] 张建奇[1] 王群书[2] 

机构地区：[1]西安电子科技大学,西安710071 [2]西北核技术研究所,西安710024

出　　处：《核电子学与探测技术》2011年第4期473-478,共6页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金面上项目(10775112)

摘　　要：闪烁体型γ射线-荧光图像转换屏是数字化辐射成像系统中的重要部件,射线与闪烁体相互作用产生的荧光弥散效应,对成像系统及其获取图像的空间分辨具有重要影响。闪烁体型γ射线-荧光图像转换屏的荧光弥散效应通常采用点扩散函数(PSF)来描述。目前,采用蒙特卡罗(MC)方法进行模拟计算,仍是确定该函数的最常用和有效方法。以LSO无机晶体和ST-401塑料闪烁体为代表,研究影响闪烁体型γ射线-荧光图像转换屏PSF的主要因素,具体分析其随闪烁体厚度、入射射线能量的变化规律,以及闪烁体中散射射线对其PSF的贡献,为辐射成像应用提供参考。同时对所发现的现象和规律进行了理论解释。The scintillator ray - light converter plays an important role in digital radiography system and affects the spatial resolution of the radiographic apparently due to its fluorescence dispersion effect. The Point Spread Function （PSF） is usually used to describe the fluorescence dispersion effect of the scintillator and presently the Monte Carlo （MC） method is still the most accurate method to calculate it. An MC computational model is used to calculate PSFs of different LS0 and ST -401 scintillators. Based on the calculation, the effect to the PSF of the scattered ray from the interaction between the incident ray and the scintillator is analyzed. The variation of the PSF with the energy of X/γ - ray and the thickness of the scintillator is discussed and explained in theory.

关 键 词：闪烁体 射线-荧光图像转换屏 点扩散函数 辐射成像 

分 类 号：O411.3[理学—理论物理] TL812.1[理学—物理]