True 3D-CT-reconstruction in comparison to the FDK-algorithm
As has already been shown with 2D-models DIRECTT1,2 (Direct iterative reconstruction of computed tomography trajectories) exceeds the spatial resolution of the classical filtered back projection. In this work the DIRECTT algorithm is extended towards cone-beam projection including iterative 3D reconstruction. The improved speed is still overcompensated by the large amount of reconstruction space and therefore intensive usage of memory. In comparison to the FDK3 (Feldkamp-Davis-Kress) algorithm we achieved a better edge resolution in all dimensions using only 5 iterations. In particular artefacts far outside of the central plane are reduced significantly. Local smearing by focal spot size and/or real detector response can be integrated in order to increase the reconstruction quality. These important improvements help using computed tomography in all kind of industrial applications. Reconstructions obtained from simulated data as well as real measurements are discussed in detail.
computed tomography spatial resolution reconstruction algorithm
Axel LANGE Manfred P. HENTSCHEL Andreas KUPSCH
Federal Institute for Materials Research and Testing (BAM); D-12200 Berlin, Germany
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
374-378
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）