Abstract #4621

Spatially Fourier Excited Acquisition and Reconstruction (SFEAR) for Improved Slice Acceleration

Negin Yaghmaie^1,2, Warda Syeda³, Yasmin Blunck^1,2, Bahman Tahayori⁴, Rebecca K. Glarin^2,5, Bradford A. Moffat^2,6, and Leigh A. Johnston^1,2

¹Department of Biomedical Engineering, The University of Melbourne, Melbourne, Australia, ²Melbourne Brain Centre Imaging Unit, The University of Melbourne, Melbourne, Australia, ³Melbourne Neuropsychiatry Centre, The University of Melbourne, Melbourne, Australia, ⁴The Florey Institute of Neuroscience and Mental Health, Melbourne, Australia, ⁵Department of Radiology, Royal Melbourne Hospital, Melbourne, Australia, ⁶Department of Medicine and Radiology, The University of Melbourne, Melbourne, Australia

Synopsis

Keywords: New Trajectories & Spatial Encoding Methods, New Trajectories & Spatial Encoding MethodsA new 3D Spatially Fourier Excited Acquisition and Reconstruction method (SFEAR) is introduced, in which double-RF pulses are used to excite sinusoidally-modulated slice profiles across a slab. Target spatial frequencies are achieved by varying the time shift between the two pulses, to construct the slice-phase-encode dimension of 3D k-space from Fourier excited acquisitions. SFEAR outperforms conventional GRAPPA in the slice-phase encode dimension, given its inherent ability to undersample sine or cosine components rather than whole planes of 3D k-space. Superior reconstruction of undersampled data and lower g-factor values are demonstrated in both 7T phantom and in vivo data.

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