Reference-free unwarping of EPI data using dynamic off-resonance correction with multiecho acquisition (DOCMA)

Visser, Eelke, Poser, Benedikt A., Barth, Markus and Zwiers, Marcel P. (2012) Reference-free unwarping of EPI data using dynamic off-resonance correction with multiecho acquisition (DOCMA). Magnetic Resonance in Medicine, 68 4: 1247-1254. doi:10.1002/mrm.24119


Author Visser, Eelke
Poser, Benedikt A.
Barth, Markus
Zwiers, Marcel P.
Title Reference-free unwarping of EPI data using dynamic off-resonance correction with multiecho acquisition (DOCMA)
Journal name Magnetic Resonance in Medicine   Check publisher's open access policy
ISSN 0740-3194
1522-2594
Publication date 2012-01-01
Sub-type Article (original research)
DOI 10.1002/mrm.24119
Volume 68
Issue 4
Start page 1247
End page 1254
Total pages 8
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Abstract Inhomogeneities of the main magnetic field cause geometric distortion in echo-planar imaging, a method central to functional MRI. A number of correction methods have been proposed, most of which are based on the acquisition of a fieldmap providing the local offsets to the main magnetic field. Here, accelerated multiecho echo-planar imaging is used, with echo times short enough to enable the construction of a fieldmap of comparable quality from the data themselves. This way, each volume in a time series can be unwarped using a fieldmap obtained from that volume, avoiding volume-to-volume field-motion interactions that invalidate reference data in conventional approaches that use a single, static, fieldmap. The combination of accelerated acquisition with dynamic distortion correction yields volumes with very low distortion at repetition times similar to conventional echo-planar imaging. The method is applied to data acquired at 3 and 7 T and is shown to effectively correct image geometry. Furthermore, it is shown that dynamic distortion correction yields better temporal signal stability than correction using a static fieldmap in the presence of subject motion. Magn Reson Med 2012. © 2011 Wiley Periodicals, Inc. Copyright
Keyword DOCMA
Dynamic distortion correction
Fieldmap
Subject motion
Susceptibility artifact
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Advanced Imaging Publications
 
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