Improved EPI at 7T with Dynamic Multi-coil Technique (DYNAMITE) Shimming
Suryanarayana Umesh Rudrapatna 1 , Terence W Nixon 1 , Scott McIntyre 1 , Robin A de Graaf 1 , and Christoph Juchem 1
Diagnostic Radiology, Yale University, New
Haven, Connecticut, United States
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
and B0-mapping datasets at 7T under DYNAMITE and 3
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
showed a shift in distribution towards higher values.
These results endorse the advantages of DYNAMITE for EPI.
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