2D EPI at 9.4T with slice-specific spokes pulse RF excitation for B1+ homogenisation
Benedikt A Poser 1 and Desmond HY Tse 1,2
Faculty of Psychology and Neuroscience,
Maastricht University, Maastricht, Netherlands,
of Radiology, Maastricht University, Maastricht,
Slice-specific spokes pulses were designed for and
applied to high resolution 2D EPI imaging at 9.4T in
order to mitigate the signal and SNR variations across
the brain due to RF inhomogeneity as typically
encountered at ultra-high field. Improvements in signal
homogeneity are demonstrated when using the
slice-specific three-spokes RF pulses instead of the
coils CP mode excitations. The B1+ shimmed EPI sequence
is applied to BOLD fMRI scans.
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