Improved EPI at 7T with Dynamic Multi-coil Technique (DYNAMITE) Shimming

Dynamic Multi-coil technique (DYNAMITE) is inherently capable of generating more complex fields than those possible with higher order spherical-harmonic shims. Thus, it has immense potential for improving EPI quality at high fields. We assessed this by acquiring multiple EPI, T ₂ ^* - and B0-mapping datasets at 7T under DYNAMITE and 3 ^rd order spherical harmonic static shims in five volunteers. Results showed significant B0 homogeneity improvement in typical hard-to-shim areas using DYNAMITE. EPI image distortions and signal drop-outs were drastically reduced. Histogram analysis of T ₂ ^* data showed a shift in distribution towards higher values. These results endorse the advantages of DYNAMITE for EPI.

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