期刊
JOURNAL OF MAGNETIC RESONANCE
卷 202, 期 2, 页码 239-244出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2009.11.004
关键词
Sodium MRI; Multiple-quantum filter; Coherence; B-0 inhomogeneity
Triple-quantum (TQ) filtered sodium MR imaging has been proposed for separation of sodium signal arising from different physiological compartments. in a three-pulse sequence without refocussing pulse, the TQ signal is strongly sensitive to inhomogeneities of the B-0 field. We examine the dependence of the TQ signal intensity on the sequence parameters and propose a modified phase-cycling scheme to improve image quality. A new method for correction of B-0 inhomogeneity artefacts in TQ filtered sodium imaging is presented which requires only two acquisitions to obtain a correction as far as the B-0 inhomogeneity and the Pulse widths are not too large. The method was verified in phantom experiments. (C) 2009 Elsevier Inc. All rights reserved.
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