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Abstract #0446

Correction of physiological field fluctuations in high- and low-resolution 3D-EPI acquisitions at 7 Tesla

Jolanda Melissa Schwarz1, Rüdiger Stirnberg1, Philipp Ehses1, and Tony Stöcker1,2

1German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany, 2Department of Physics and Astronomy, University of Bonn, Bonn, Germany

Segmented gradient-echo 3D-EPI images suffer from physiologically induced field fluctuations due to long echo times and k-space data acquisition across multiple shots. In this work, the effect of 0th-order B0 correction on high-resolution and low-resolution 3D-EPI acquisitions is investigated by means of a 16-channel NMR field probe system. A clear improvement in image quality and tSNR can be observed, particularly for highly segmented, high-resolution 3D-EPI. However, remaining artifacts indicate the importance of correction for higher-order field terms.

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