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Virtual coil concept for improved parallel MRI employing conjugate symmetric signals
Author(s) -
Blaimer Martin,
Gutberlet Marcel,
Kellman Peter,
Breuer Felix A.,
Köstler Herbert,
Griswold Mark A.
Publication year - 2009
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.21652
Subject(s) - electromagnetic coil , conjugate , computer science , phase (matter) , noise (video) , process (computing) , symmetry (geometry) , space (punctuation) , complex conjugate , phase space , algorithm , artificial intelligence , nuclear magnetic resonance , computer vision , image (mathematics) , physics , mathematics , mathematical analysis , geometry , quantum mechanics , operating system , thermodynamics
A new approach for utilizing conjugate k ‐space symmetry for improved parallel MRI performance is presented. By generating virtual coils containing conjugate symmetric k ‐space signals from actual coils, additional image‐ and coil‐phase information can be incorporated into the reconstruction process for parallel acquisition techniques. In that way the reconstruction conditions are improved, resulting in less noise enhancement. In particular in combination with generalized autocalibrating partially parallel acquisitions (GRAPPA), the virtual coil concept represents a practical approach since no explicit spatial phase information is required. In addition, the influence of phase variations originating from the complex receiver coils as well as from the background is investigated. It is shown that there exist background phase distributions yielding an optimized pMRI reconstruction. Magn Reson Med 61:93–102, 2009. © 2008 Wiley‐Liss, Inc.