有限角度CT重建方法

CT Reconstruction for Limited Angle

计算机断层成像技术(Computed Tomography,CT)技术已经被广泛应用于医学诊断、工业无损探伤以及安全检查等领域。然而在实际应用中,很多情况下并不能采集到完全角度下的投影数据,例如成像系统设计的限制等。利用有限角度下的投影数据进行图像重建被称为X射线成像有限角度重建。本文介绍了两种有限角度CT迭代重建方法,并对其重建结果进行了比较和评价。

Computed Tomography(CT) has made a revolutionary impact on medical diagnosis and industrial non-destructive testing.However,it is not always possible to acquire projection data through a complete CT angular range in some real applications,such as imaging system design constraints.The conventional and most commonly used method for reconstruction from tomographic projections is the analytical reconstruction technique which is not so adaptable to incomplete projection data and results in poor reconstructions with severe artifacts in limited angle cases.Two reconstruction algorithms for limited angle cases are illustrated and the performance of algorithms is shown.