X射线成像积分滤波模型与实验
X-ray Imaging Integral Filter Model and Experiment
摘要
Abstract
Deficiencies of X-ray digital imaging system are mainly shown in the following aspects:imaging end coupling constrained, bottleneck constrained by microfocus, photonic defect and con-strained quantum noise, etc. . It is difficult for the effective image filtering through traditional digital image processing techniques to be realized. Its effect is further constrained by the complicated filte-ring algorithm. To improve the optical transmission capacity and system noise immunity of X-ray im-aging system, in this paper, the thermal excited X-ray source and X-ray image intensifier were taken as examples, a number of imaging technical difficulties were explored from system level, and a inte-gral filtering method on X-ray imaging was put forward. Then, the frequency-fixed leaden raster was taken as the tested object. By changing the object-image relation of relay optical coupling system, the image place frequency could be changed continuously within a certain range. By lots of experi-mental data, the accurate fitness of OTF ( optical transfer function) can be realized under different integral time conditions. It is proved that this filtering method can not only effectively suppress the quantum noise caused by hot trigger source in avoid of photonic defect on image, but also obviously improve the optical transmission capacity of imaging system from angles of OTF integral effect and normalized baseband transmission characteristics respectively. Finally, the superiority of this filte-ring method was testified from perspective of contrasting frame-adding and integral filtering.关键词
X射线/对比度/积分滤波/调制传递函数/像增强器Key words
X-ray/contrast/integrator filter/modulation transfer function/image intensifier分类
信息技术与安全科学引用本文复制引用
刘春阳,王贺,母一宁..X射线成像积分滤波模型与实验[J].发光学报,2017,38(7):978-983,6.基金项目
吉林省青年科研基金(20140520122JH, 20160520114JH) （20140520122JH, 20160520114JH）
吉林省科技发展计划重点科技攻关项目(20150204083GX, 20150204049GX) （20150204083GX, 20150204049GX）
吉林省教育厅"十三五"科学技术研究项目(吉教科 2016357) （吉教科 2016357）
国家自然科学基金青年科学基金(51602028) （51602028）
长春理工大学科技创新基金 (XJJLG-2015-02)资助项目 Supported by Youth Research Foundation of Jilin Province(20140520122JH, 20160520114JH) （XJJLG-2015-02）
Key Scientific and Technological Research Project of Jilin Science and Technology Development Plan (20150204083GX, 20150204049GX) （20150204083GX, 20150204049GX）
'13th Five-Year' Science and Technology Research Project of Education Department of Jilin Province(Jijiaoke 2016357) （Jijiaoke 2016357）
National Natural Science Foundation for Youth(51602028) （51602028）
Science and Technology Innovation Fund of Changchun University of Science and Technology (XJJLG-2015-02) （XJJLG-2015-02）
