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- Title
Phase-corrected bipolar gradients in multi-echo gradient-echo sequences for quantitative susceptibility mapping.
- Authors
Li, Jianqi; Chang, Shixin; Liu, Tian; Jiang, Hongwei; Dong, Fang; Pei, Mengchao; Wang, Qianfeng; Wang, Yi
- Abstract
Objective: Large echo spacing of unipolar readout gradients in current multi-echo gradient-echo (GRE) sequences for mapping fields in quantitative susceptibility mapping (QSM) can be reduced using bipolar readout gradients thereby improving acquisition efficiency. Materials and methods: Phase discrepancies between odd and even echoes in the bipolar readout gradients caused by non-ideal gradient behaviors were measured, modeled as polynomials in space and corrected for accordingly in field mapping. The bipolar approach for multi-echo GRE field mapping was compared with the unipolar approach for QSM. Results: The odd-even-echo phase discrepancies were approximately constant along the phase encoding direction and linear along the readout and slice-selection directions. A simple linear phase correction in all three spatial directions was shown to enable accurate QSM of the human brain using a bipolar multi-echo GRE sequence. Bipolar multi-echo acquisition provides QSM in good quantitative agreement with unipolar acquisition while also reducing noise. Conclusion: With a linear phase correction between odd-even echoes, bipolar readout gradients can be used in multi-echo GRE sequences for QSM.
- Subjects
MAGNETIC susceptibility; PHASE coding; POLYNOMIALS; NOISE control; BRAIN imaging
- Publication
MAGMA: Magnetic Resonance Materials in Physics, Biology & Medicine, 2015, Vol 28, Issue 4, p347
- ISSN
0968-5243
- Publication type
Article
- DOI
10.1007/s10334-014-0470-3