基于平板探测器的2D-CT成像技术的研究  

Research on 2D-CT imaging technique based on flat panel detector

作　　者：傅健[1] 路宏年[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100083

出　　处：《光学技术》2005年第5期662-665,共4页Optical Technique

基　　金：国防科工委基础科研项目(C132003C001);博士后科学基金项目(2004036038);北京大学工程研究院科研合作平台建设计划项目(204042)

摘　　要：大面积非晶硅平板探测器(flat panel detector-FPD)在透射射线成像领域得到越来越多的应用。基于FPD的圆轨道FDK型三维计算机层析成像技术(Computed Tomography,3D-CT)检测速度快,但成像质量不及2D-CT。为发挥3D-CT速度优势,同时提高系统对物体感兴趣区域CT成像的性能,研究了一种基于FPD的、配合3D-CT功能的高像质2D-CT成像技术;提出了一种集噪声抑制、散射校正和高频细节增强于一体的2D-CT投影预处理方法,并完成了基于FPD的2D/3D-CT集成原型系统的研制。系统性能测试结果表明,基于FPD的2D-CT技术成像空间分辨率达3lp/mm,密度分辨率达5‰。Large-area a-Si X-ray fiat panel detector（FPD） is becoming more and more popular in the field of transmission radiation imaging. FDK-type three dimensional computed tomography（3D-CT） with circular orbit based on FPD can execute inspection rapidly, but its imaging quality can not reach that of 2D-CT. In order to make the best of the speed advantage of 313- CT and improve the performance of the system to image the region-of-interest area, 2D-CT based on FPD with high imaging quality was researched. The corresponding projection pre-procession method, including noise reduction, scatter correction and high-frequency detail intensification, was proposed. The 2D/3D-CT and DR integration system based on FPD was realized. The performance testing results of the system showed that the spatial resolution of this kind of technique reached 31p/mm and the density resolution reached 5‰.

关 键 词：计算机层析成像 平板探测器 2D-CT 3D-CT 射线检测 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]