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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