Open AccessSuppression of ring artefacts when tomographing anisotropically attenuating samples
Author(s) -
Titarenko Sofya,
Titarenko Valeriy,
Kyrieleis Albrecht,
Withers Philip J.,
De Carlo Francesco
Publication year - 2011
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049511006005
Subject(s) - regularization (linguistics) , ring (chemistry) , matrix (chemical analysis) , attenuation , composite number , optics , materials science , tomography , tomographic reconstruction , physics , computer science , chemistry , composite material , artificial intelligence , organic chemistry
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.