title: Suppression of ring artefacts when tomographing anisotropically attenuating samples.
abstract: There are many objects for which the attenuation varies significantly as they are rotated during computerized X-ray tomography, for example plate samples. This can lead to significant ring artefacts in the subsequent tomographic reconstructions. In this paper a new method is presented that can successfully suppress such ring artefacts and is applicable to both parallel and cone-beam geometries. Rapid correction is achieved via an analytical formula which involves only a matrix-vector multiplication, for which the matrix is known and depends on a regularization parameter. The efficacy of the method is demonstrated for a paleontological sample (calcified shark cartilage) and a carbon-carbon composite/Ti-SiC metal matrix composite test sample.
authors.affiliation: Department of Mathematics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow 119991, Russia. valeriy.titarenko@manchester.ac.uk
authors.forename: Sofya
authors.initials: S
authors.lastname: Titarenko
authors.forename: Valeriy
authors.initials: V
authors.lastname: Titarenko
authors.forename: Albrecht
authors.initials: A
authors.lastname: Kyrieleis
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Withers
authors.forename: Francesco
authors.initials: F
authors.lastname: De Carlo