【摘要】 本文提出了一种基于C型臂的有限角锥形束三维重建迭代算法,针对C型臂的几何结构给出了相应的FDK算法的表达,在迭代外推的过程中恰当地加入了非负、有界、投影数据质量守恒等先验知识以及相邻角度的投影数据保持一定的光滑性这一正则化准则。实验结果表明,这种新方法能较好地消除条状伪影,并能显著提高重建图像的对比度。更多还原

【Abstract】 In this paper,a new 3D iterative reconstruction algorithm for C-arm imaging systems from limited-angle of cone beam projections was proposed.The well-known FDK algorithm was adapted for C-arm imaging systems.Our approach was to introduce prior knowledge and regularizations(such as non negative,limited support) into iterative procedure.Experiments show that by our method,the streak artifacts can be greatly suppressed and the contrast can be significantly improved.更多还原