Virtual coil concept for improved parallel MRI employing conjugate symmetric signals |
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| Authors: | Martin Blaimer Marcel Gutberlet Peter Kellman Felix A. Breuer Herbert Köstler Mark A. Griswold |
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| Affiliation: | 1. Department of Radiology, University Hospitals of Cleveland and Case Western Reserve University, Cleveland, Ohio;2. Research Center Magnetic Resonance Bavaria (MRB), Würzburg, Germany;3. Experimentelle MR Tomographie, Institut für R?ntgendiagnostik, Universit?t Würzburg, Würzburg, Germany;4. Laboratory of Cardiac Energetics, National Institutes of Health, National Heart, Lung, and Blood Institute, Bethesda, Maryland |
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| Abstract: | ![]()
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. |
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| Keywords: | parallel MRI conjugate symmetry SENSE GRAPPA |
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