title: A multiresolution approach to iterative reconstruction algorithms in X-ray computed tomography.
abstract: In computed tomography, the application of iterative reconstruction methods in practical situations is impeded by their high computational demands. Especially in high resolution X-ray computed tomography, where reconstruction volumes contain a high number of volume elements (several giga voxels), this computational burden prevents their actual breakthrough. Besides the large amount of calculations, iterative algorithms require the entire volume to be kept in memory during reconstruction, which quickly becomes cumbersome for large data sets. To overcome this obstacle, we present a novel multiresolution reconstruction, which greatly reduces the required amount of memory without significantly affecting the reconstructed image quality. It is shown that, combined with an efficient implementation on a graphical processing unit, the multiresolution approach enables the application of iterative algorithms in the reconstruction of large volumes at an acceptable speed using only limited resources.
authors.affiliation: Centre for X-Ray Tomography, Department of Physics and Astronomy, Ghent University, Ghent, Belgium. Yoni.DeWitte@UGent.be
authors.forename: Yoni
authors.initials: Y
authors.lastname: De Witte
authors.forename: Jelle
authors.initials: J
authors.lastname: Vlassenbroeck
authors.forename: Luc
authors.initials: L
authors.lastname: Van Hoorebeke
mesh_terms: D000465:Algorithms; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*