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Publication Detail
Susceptibility artefact correction by combining B0 field maps and non-rigid registration using graph cuts
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  • Authors:
    Daga P, Modat M, Winston G, White M, Mancini L, Mcevoy AW, Thornton J, Yousry T, Duncan JS, Ourselin S
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    Progress in Biomedical Optics and Imaging - Proceedings of SPIE
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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. © 2013 SPIE.
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