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Optimization of signal behavior in the transition to driven equilibrium in steady-state free precession sequences

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Hennig, J., Speck, O., & Scheffler, K. (2002). Optimization of signal behavior in the transition to driven equilibrium in steady-state free precession sequences. Magnetic Resonance in Medicine, 48(5), 801-809. doi:10.1002/mrm.10274.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-DE4C-E
Abstract
A new technique to avoid the initial signal fluctuations in steady-state free precession (SSFP)-sequences, such as trueFISP, FIESTA, and refocused FFE, is presented. The “transition into driven equilibrium” (TIDE) sequence uses modified flip angles over the initialization phase of a SSFP experiment, which not only avoids image artifacts but also improves the signal-to-noise ratio (SNR) and contrast behavior compared to conventional approaches. TIDE is demonstrated to be robust against variations of T1 and T2, and leads to a monotonous signal evolution for off-resonance spins. The basic principles can also be applied repetitively to optimize continuous 3D acquisitions.