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Multiband multislice GE‐EPI at 7 tesla, with 16‐fold acceleration using partial parallel imaging with application to high spatial and temporal whole‐brain fMRI
Author(s) -
Moeller Steen,
Yacoub Essa,
Olman Cheryl A.,
Auerbach Edward,
Strupp John,
Harel Noam,
Uğurbil Kâmil
Publication year - 2010
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.22361
Subject(s) - undersampling , nuclear magnetic resonance , physics , multislice , temporal resolution , excitation , optics , computer science , artificial intelligence , quantum mechanics
Parallel imaging in the form of multiband radiofrequency excitation, together with reduced k ‐space coverage in the phase‐encode direction, was applied to human gradient echo functional MRI at 7 T for increased volumetric coverage and concurrent high spatial and temporal resolution. Echo planar imaging with simultaneous acquisition of four coronal slices separated by 44mm and simultaneous 4‐fold phase‐encoding undersampling, resulting in 16‐fold acceleration and up to 16‐fold maximal aliasing, was investigated. Task/stimulus‐induced signal changes and temporal signal behavior under basal conditions were comparable for multiband and standard single‐band excitation and longer pulse repetition times. Robust, whole‐brain functional mapping at 7 T, with 2 × 2 × 2mm 3 (pulse repetition time 1.25 sec) and 1 × 1 × 2mm 3 (pulse repetition time 1.5 sec) resolutions, covering fields of view of 256 × 256 × 176mm 3 and 192 × 172 × 176mm 3 , respectively, was demonstrated with current gradient performance. Magn Reson Med 63:1144–1153, 2010. © 2010 Wiley‐Liss, Inc.