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Abstract #3571

Local shim coils improve B0 homogeneity achieving high signal to noise in preclinical echo-planar imaging recordings

Dirk Ernst Cleppien1, Sahar Nassirpour2, Paul Chang2, and Albrecht Stroh1,3
1Leibniz Institute for Resilience Research, Mainz, Germany, 2MRShim GmbH, Reutlingen, Germany, 3Institute of Physiology I, Neurophysiology, University Hospital Muenster (UKM), Muenster, Germany

Synopsis

Keywords: fMRI Acquisition, Shims, Local shim coils

Motivation: In preclinical imaging, echo-planar imaging (EPI) techniques are prone to B0- inhomogeneities resulting in signal reduction and distortions in the acquired image series. While the established method using spherical harmonics (SH) for B0-homogenization is insufficient for strong inhomogeneities, local shim coils (LSC) represent a promising approach.

Goal(s): We tested how effectively a new LSC-design reduces B0-inhomogeneities.

Approach: The LSCs were placed under the head of an examined rat and the SNR in EPI recordings was compared with the SH method.

Results: LSCs reduce B0-inhomogeneities more effectively than the SH method, resulting in higher overall SNR and less distortions in EPI recordings.

Impact: In preclinical fMRI, local shim coils reduce B0-inhomogeneities more effectively than the established method based on spherical harmonics achieving higher signal to noise and less distortions in echo-planar imaging recordings.

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