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Simultaneous fat suppression and band reduction with large‐angle multiple‐acquisition balanced steady‐state free precession
Author(s) -
Quist Brady,
Hargreaves Brian A.,
Cukur Tolga,
Morrell Glen R.,
Gold Garry E.,
Bangerter Neal K.
Publication year - 2012
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.23076
Subject(s) - voxel , computer science , reduction (mathematics) , artifact (error) , specific absorption rate , magnetic resonance imaging , materials science , computer vision , mathematics , radiology , telecommunications , medicine , geometry , antenna (radio)
Abstract Balanced steady‐state free precession (bSSFP) MRI is a rapid and signal‐to‐noise ratio‐efficient imaging method, but suffers from characteristic bands of signal loss in regions of large field inhomogeneity. Several methods have been developed to reduce the severity of these banding artifacts, typically involving the acquisition of multiple bSSFP datasets (and the accompanying increase in scan time). Fat suppression with bSSFP is also challenging; most existing methods require an additional increase in scan time, and some are incompatible with bSSFP band‐reduction techniques. This work was motivated by the need for both robust fat suppression and band reduction in the presence of field inhomogeneity when using bSSFP for flow‐independent peripheral angiography. The large flip angles used in this application to improve vessel conspicuity and contrast lead to specific absorption rate considerations, longer repetition times, and increased severity of banding artifacts. In this work, a novel method that simultaneously suppresses fat and reduces bSSFP banding artifact with the acquisition of only two phase‐cycled bSSFP datasets is presented. A weighted sum of the two bSSFP acquisitions is taken on a voxel‐by‐voxel basis, effectively synthesizing an off‐resonance profile at each voxel that puts fat in the stop band while keeping water in the pass band. The technique exploits the near‐sinusoidal shape of the bSSFP off‐resonance spectrum for many tissues at large (>50°) flip angles. Magn Reson Med, 2011. © 2011 Wiley Periodicals, Inc.