TY - JOUR
T1 - Dual-acquisition phase-sensitive fat-water separation using balanced steady-state free precession
AU - Hargreaves, Brian A.
AU - Bangerter, Neal K.
AU - Shimakawa, Ann
AU - Vasanawala, Shreyas S.
AU - Brittain, Jean H.
AU - Nishimura, Dwight G.
PY - 2006/2
Y1 - 2006/2
N2 - Balanced steady-state free precession (SSFP) sequences use fully refocused 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.
AB - Balanced steady-state free precession (SSFP) sequences use fully refocused 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.
KW - Fat suppression
KW - Rapid imaging
KW - SSFP
KW - Steady state
UR - http://www.scopus.com/inward/record.url?scp=31744447485&partnerID=8YFLogxK
U2 - 10.1016/j.mri.2005.10.013
DO - 10.1016/j.mri.2005.10.013
M3 - Article
C2 - 16455400
AN - SCOPUS:31744447485
SN - 0730-725X
VL - 24
SP - 113
EP - 122
JO - Magnetic Resonance Imaging
JF - Magnetic Resonance Imaging
IS - 2
ER -