摘要
通过对具有二维高斯型相位分布特征物体的X射线同轴相衬成像技术进行理论分析,提出了一种基于图像信噪比的成像系统优化设计方法。采用数值模拟的方式分别对亚微焦点源、激光驱动微焦点源和同步辐射源三种X射线源下的成像系统进行了优化设计,结果表明:相对于最大化衬度的系统优化设计方法,信噪比优化设计方法在较小降低衬度的前提下,可以较好地改善图像信噪比并得到更为合理的成像距离。
The optimized design method based on signal to noise ratio of the image is presented for the object of two-dimen- sional Gaussian distribution based on the theoretical analysis of the technology of X-ray in-line phase contrast imaging. The ima- ging systems under the radiation of sub micrometer focus X-ray source, laser based micrometer focus X-ray source and synchro- tron radiation X-ray source are optimized by means of numerical simulation. The outcome shows that the method based on signal to noise ratio can increase the signal to noise ratio of the image and get more reasonable imaging distance premised by decreasing the contrast slightly when compared with the contrast method.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第4期1021-1025,共5页
High Power Laser and Particle Beams
基金
国防科技基础研究基金项目
关键词
X射线
同轴相衬
二维高斯分布
信噪比
优化设计
X-ray
in-line phase contrast
two dimensional Gaussian distribution
signal to noise ratio
optimized design
