Analysis of multiple-acquisition SSFP
Analysis of multiple-acquisition SSFP
复制标题
DOI：
10.1002/mrm.20052
复制
发表时间：
2004-05-01
影响因子：
3.3
通讯作者：
Nishimura, DG
中科院分区：
文献类型：
--
作者：
Bangerter, NK;Hargreaves, BA;Nishimura, DG
重聚焦稳态自由进动 (SSFP) 因其对局部场变化的高敏感性而受到限制，特别是在高场强或高分辨率所需的长重复时间 (TR) 下。已经提出了几种方法来通过组合多个相位循环 SSFP 采集来减少 SSFP 带状伪影，每种方法在单个信号幅度和相位的组合方式上有所不同。其中包括最大强度 SSFP (MI-SSFP) 和复数 SSFP (CS-SSFP)。 SSFP 频带的减少伴随着信噪比 (SNR) 效率的损失。在这项工作中，提出了一个用于分析任何多重采集 SSFP 组合方法的带状伪影减少、对比度和 SNR 的通用框架。提出了一种新的平方和方法，并对各个组合方案进行了比较。平方和 SSFP 技术 (SOS-SSFP) 与其他多重采集技术相比，可实现稳健的带状伪影减少和更高的 SNR 效率，同时保留 SSFP 对比度。 (C) 2004 Wiley-Liss, Inc.
Refocused steady-state free precession (SSFP) is limited by its high sensitivity to local field variation, particularly at high field strengths or the long repetition times (TRs) necessary for high resolution. Several methods have been proposed to reduce SSFP banding artifact by combining multiple phase-cycled SSFP acquisitions, each differing in how individual signal magnitudes and phases are combined. These include maximum-intensity SSFP (MI-SSFP) and complex-sum SSFP (CS-SSFP). The reduction in SSFP banding is accompanied by a loss in signal-to-noise ratio (SNR) efficiency. In this work a general framework for analyzing banding artifact reduction, contrast, and SNR of any multiple-acquisition SSFP combination method is presented. A new sum-of-squares method is proposed, and a comparison is performed between each of the combination schemes. The sum-of-squares SSFP technique (SOS-SSFP) delivers both robust banding artifact reduction and higher SNR efficiency than other multiple-acquisition techniques, while preserving SSFP contrast. (C) 2004 Wiley-Liss, Inc.