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 Stöcker^1,2

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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