Improving the spatial resolution of whole-head magnetic resonance inverse imaging using partition-encoding gradient blips
Wei-Tang Chang 1 , kawin Setsompop 1 , Jyrki Ahveninen 1 , John Belliveau 1 , Thomas Witzel 1 , and Fa-Hsuan Lin 2
Martinos Center for Biomedical Imaging,
Massachusetts General Hospital, Charlestown, MA, United
of Biomedical Engineering, National Taiwan University,
Taipei, Taiwan, Taiwan
Using simultaneous acquisition from multiple channels of
a radio-frequency (RF) coil array, magnetic resonance
inverse imaging (InI) achieves functional MRI
acquisitions at a rate of 100 ms per whole-brain volume.
InI accelerates the scan by leaving out partition
encoding steps and reconstructs images by solving
under-determined inverse problems using RF coil
sensitivity information. Hence, the correlated spatial
information available in the coil array causes spatial
blurring in the InI reconstruction. Here, we propose a
method that employs gradient blips in the partition
encoding direction during the acquisition to provide
extra spatial encoding in order to better differentiate
signals from different partitions.
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