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  Correction of physiologically induced global off-resonance effects in dynamic echo-planar and spiral functional imaging

Pfeuffer, J., de Moortele, P.-F., Ugurbil, K., Hu, X., & Glover, G. (2002). Correction of physiologically induced global off-resonance effects in dynamic echo-planar and spiral functional imaging. Magnetic Resonance in Medicine, 47(2), 344-353. doi:10.1002/mrm.10065.

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Pfeuffer, J1, 2, Author              
de Moortele, P-FV, Author
Ugurbil , K, Author
Hu, X, Author
Glover, GH, Author
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: In functional magnetic resonance imaging, a rapid method such as echo-planar (EPI) or spiral is used to collect a dynamic series of images. These techniques are sensitive to changes in resonance frequency which can arise from respiration and are more significant at high magnetic fields. To decrease the noise from respiration-induced phase and frequency fluctuations, a simple correction of the “dynamic off-resonance in k-space” (DORK) was developed. The correction uses phase information from the center of k-space and a navigator echo and is illustrated with dynamic scans of single-shot and segmented EPI and, for the first time, spiral imaging of the human brain at 7 T. Image noise in the respiratory spectrum was measured with an edge operator. The DORK correction significantly reduced respiration-induced noise (image shift for EPI, blurring for spiral, ghosting for segmented acquisition). While spiral imaging was found to exhibit less noise than EPI before correction, the residual noise after the DORK correction was comparable. The correction is simple to apply and can correct for other sources of frequency drift and fluctuations in dynamic imaging.

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 Dates: 2002-02
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1002/mrm.10065
BibTex Citekey: 1218
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: 47 (2) Sequence Number: - Start / End Page: 344 - 353 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149