【摘要】 三维CT系统是CT研究最活跃的前沿课题之一,三维重建算法1984年就由Feldcamp等提出,完成了三维CT的数学基础,为把计算时间减少到可接受的程度,我们采用几何参数表法成倍地缩短了重建时间。随着面阵列CCD探测器和新型平板探测器的出现,三维CT的硬件基础也已成熟,本文介绍了基于科研级CCD相机和非晶硅平板探测器的两种典型三维CT系统,并介绍了应用以上两套三维CT在生物医学和工业无损检测中的部分应用结果。更多还原

【Abstract】 3D CT is one of the popular fields of CT Research,3D Reconstruction algorithm is put forward by Feldcamp in 1984,which is algorithm basis of 3D cone beam CT.We put forward geometric parameter method,on basis of FDK(Feldcamp-Davis-Kress)algorithm,to reduce redundant calculation in reconstruction.With availability of CCD and flat-panel detector,hardware basis of 3D cone beam CT become mature.In this paper,we introduced two types of 3D CT system on basis of scientific CCD camera detector and flat-panel detector.At last, application of these two 3D CT systems in biomedical and industrial non-destructive filed are introduced.更多还原