title: A multiresolution approach to discrete tomography using DART.
abstract: In discrete tomography, a scanned object is assumed to consist of only a few different materials. This prior knowledge can be effectively exploited by a specialized discrete reconstruction algorithm such as the Discrete Algebraic Reconstruction Technique (DART), which is capable of providing more accurate reconstructions from limited data compared to conventional reconstruction algorithms. However, like most iterative reconstruction algorithms, DART suffers from long computation times. To increase the computational efficiency as well as the reconstruction quality of DART, a multiresolution version of DART (MDART) is proposed, in which the reconstruction starts on a coarse grid with big pixel (voxel) size. The resulting reconstruction is then resampled on a finer grid and used as an initial point for a subsequent DART reconstruction. This process continues until the target pixel size is reached. Experiments show that MDART can provide a significant speed-up, reduce missing wedge artefacts and improve feature reconstruction in the object compared with DART within the same time, making its use with large datasets more feasible.
authors.affiliation: iMinds-Vision lab, University of Antwerp, Antwerp, Belgium.
authors.forename: Andrei
authors.initials: A
authors.lastname: Dabravolski
authors.affiliation: iMinds-Vision lab, University of Antwerp, Antwerp, Belgium; Centrum Wiskunde & Informatica (CWI), Amsterdam, The Netherlands; Mathematical Institute, Leiden University, Leiden, The Netherlands.
authors.forename: Kees Joost
authors.initials: KJ
authors.lastname: Batenburg
authors.affiliation: iMinds-Vision lab, University of Antwerp, Antwerp, Belgium.
authors.forename: Jan
authors.initials: J
authors.lastname: Sijbers
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D007091:Image Processing, Computer-Assisted / Q000379:methods; D019047:Phantoms, Imaging; D014054:Tomography / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods