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Dual-acquisition phase-sensitive fat-water separation using balanced steady-state free precession.

Abstract：

:Balanced steady-state free precession (SSFP) sequences use fully re-focussed gradient waveforms to achieve a high signal and useful image contrast in short scan times. Despite these strengths, the clinical feasibility of balanced SSFP is still limited both by bright fat signal and by the signal voids that result from off-resonance effects such as field or susceptibility variations. A new method, dual-acquisition phase-sensitive SSFP, combines the signals from two standard balanced SSFP acquisitions to separate fat and water while simultaneously reducing the signal voids. The acquisitions are added in quadrature and then phase corrected using a simple algorithm before fat and water can be identified simply by the sign of the signal. This method is especially useful for applications at high field, where the RF power deposition, spatial resolution requirements and gradient strength limit the minimum repetition times. Finally, dual-acquisition phase-sensitive SSFP can be combined with other magnetization preparation schemes to produce specific image contrast in addition to separating fat and water signals.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Hargreaves BA,Bangerter NK,Shimakawa A,Vasanawala SS,Brittain JH,Nishimura DG

doi

10.1016/j.mri.2005.10.013

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

113-22

issue

2

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(05)00321-8

journal_volume

24

pub_type

杂志文章

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