Dual-acquisition phase-sensitive fat-water separation using balanced steady-state free precession
Dual-acquisition phase-sensitive fat-water separation using balanced steady-state free precession
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DOI：
10.1016/j.mri.2005.10.013
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发表时间：
2006-02-01
影响因子：
2.5
通讯作者：
Nishimura, DG
中科院分区：
文献类型：
--
作者：
Hargreaves, BA;Bangerter, NK;Nishimura, DG
平衡稳态自由进动（SSFP）序列使用完全重聚焦梯度波形，在短扫描时间内实现高信号和有用的图像对比度。尽管有这些优势，但平衡SSFP的临床可行性仍然受到明亮脂肪信号和非共振效应（如场或敏感性变化）导致的信号空洞的限制。一种新的方法，双采集相敏SSFP，结合来自两个标准平衡SSFP采集的信号来分离脂肪和水，同时减少信号的空隙。采集的数据在正交中添加，然后使用简单的算法进行相位校正，然后只需通过信号的符号即可识别脂肪和水。该方法特别适用于高场应用，其中射频功率沉积，空间分辨率要求和梯度强度限制了最小重复次数。最后，双采集相敏SSFP可以与其他磁化制备方案结合，除了分离脂肪和水信号外，还可以产生特定的图像对比度。(C) 2006爱思唯尔公司版权所有。
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. (C) 2006 Elsevier Inc. All rights reserved.