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Springer, Lecture Notes in Computer Science, p. 271-279, 2008

DOI: 10.1007/978-3-540-85990-1_33

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Fieldmap-Free Retrospective Registration and Distortion Correction for EPI-based Functional Imaging

Journal article published in 2008 by Clare Poynton, Mark Jenkinson ORCID, Stephen Whalen, Alexandra J. Golby, William Wells
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We describe a method for correcting the distortions present in echo planar images (EPI) and registering the EPI to structural MRI. A fieldmap is predicted from an air / tissue segmentation of the MRI using a perturbation method and subsequently used to unwarp the EPI data. Shim and other missing parameters are estimated by registration. We obtain results that are similar to those obtained using fieldmaps, however neither fieldmaps, nor knowledge of shim coefficients is required.