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Comparison of parallel MRI reconstruction methods for accelerated 3D fast spin‐echo imaging
Author(s) -
Xiao Zhikui,
Hoge W. Scott,
Mulkern R.V.,
Zhao Lei,
Hu Guangshu,
Kyriakos Walid E.
Publication year - 2008
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.21679
Subject(s) - nuclear magnetic resonance , spin echo , magnetic resonance imaging , fast spin echo , echo (communications protocol) , computer science , physics , medicine , radiology , computer network
Parallel MRI (pMRI) achieves imaging acceleration by partially substituting gradient‐encoding steps with spatial information contained in the component coils of the acquisition array. Variable‐density subsampling in pMRI was previously shown to yield improved two‐dimensional (2D) imaging in comparison to uniform subsampling, but has yet to be used routinely in clinical practice. In an effort to reduce acquisition time for 3D fast spin‐echo (3D‐FSE) sequences, this work explores a specific nonuniform sampling scheme for 3D imaging, subsampling along two phase‐encoding (PE) directions on a rectilinear grid. We use two reconstruction methods—2D‐GRAPPA‐Operator and 2D‐SPACE RIP—and present a comparison between them. We show that high‐quality images can be reconstructed using both techniques. To evaluate the proposed sampling method and reconstruction schemes, results via simulation, phantom study, and in vivo 3D human data are shown. We find that fewer artifacts can be seen in the 2D‐SPACE RIP reconstructions than in 2D‐GRAPPA‐Operator reconstructions, with comparable reconstruction times. Magn Reson Med 60:650–660, 2008. © 2008 Wiley‐Liss, Inc.