Optimization of signal behavior in the transition to driven equilibrium in steady-state free precession sequences
Optimization of signal behavior in the transition to driven equilibrium in steady-state free precession sequences
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DOI：
10.1002/mrm.10274
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发表时间：
2002-11-01
影响因子：
3.3
通讯作者：
Scheffler, K
中科院分区：
文献类型：
--
作者：
Hennig, J;Speck, O;Scheffler, K
提出了一种避免稳态自由进动 (SSFP) 序列（例如 true-FISP、FIESTA 和重新聚焦 FFE）中初始信号波动的新技术。 “过渡到驱动平衡”(TIDE) 序列在 SSFP 实验的初始化阶段使用修改后的翻转角，与传统方法相比，这不仅避免了图像伪影，而且还提高了信噪比 (SNR) 和对比度行为。 TIDE 被证明对 T-1 和 T-2 的变化具有鲁棒性，并导致非共振自旋的单调信号演化。还可以重复应用基本原理来优化连续 3D 采集。 (C) 2002 Wiley-Liss, Inc.
A new technique to avoid the initial signal fluctuations in steady-state free precession (SSFP)-sequences, such as true-FISP, 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 T-1 and T-2, and leads to a monotonous signal evolution for off-resonance spins. The basic principles can also be applied repetitively to optimize continuous 3D acquisitions. (C) 2002 Wiley-Liss, Inc.