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Proceedings Paper

Susceptibility artefact correction by combining B0 field maps and non-rigid registration using graph cuts
Author(s): Pankaj Daga; Marc Modat; Gavin Winston; Mark White; Laura Mancini; Andrew W. McEvoy; John Thornton; Tarek Yousry; John S. Duncan; Sebastien Ourselin
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Paper Abstract

We present a novel method for correction of geometric distortions arising from susceptibility artefacts in echo-planar MRI images that combines fieldmap and an image registration based correction technique in a unified framework. The geometric distortions arising from these artefacts lead to inaccurate alignment of images from different MRI techniques and hinders their joint analysis. A novel phase unwrapping algorithm is presented that can efficiently compute the B0 field inhomogeneity map as well as the confidence associated with the estimated solution. This information is used to adaptively drive a subsequent image registration step to further refine the results in low-confidence areas. The effectiveness of the proposed unified algorithm in correcting for geometric distortions due to susceptibility artefacts is demonstrated on interventional MRI EPI images.

Paper Details

Date Published: 13 March 2013
PDF: 6 pages
Proc. SPIE 8669, Medical Imaging 2013: Image Processing, 86690B (13 March 2013); doi: 10.1117/12.2006800
Show Author Affiliations
Pankaj Daga, Univ. College London (United Kingdom)
Marc Modat, Univ. College London (United Kingdom)
Gavin Winston, Univ. College London (United Kingdom)
Mark White, Univ. College London (United Kingdom)
Laura Mancini, Univ. College London (United Kingdom)
Andrew W. McEvoy, Univ. College London (United Kingdom)
John Thornton, Univ. College London (United Kingdom)
Tarek Yousry, Univ. College London (United Kingdom)
John S. Duncan, Univ. College London (United Kingdom)
Sebastien Ourselin, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 8669:
Medical Imaging 2013: Image Processing
Sebastien Ourselin; David R. Haynor, Editor(s)

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