Realignment capability of the nCPMG sequence
Realignment capability of the nCPMG sequence
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DOI：
10.1016/j.jmr.2011.05.005
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发表时间：
2011-08-01
影响因子：
2.2
通讯作者：
Fernandez, B.
中科院分区：
文献类型：
--
作者：
Le Roux, P.;McKinnon, G.;Fernandez, B.
nCPMG序列基于重聚焦脉冲串的特定相位调制，并且最初被设计用于使自旋回波幅度对初始磁化相位不敏感。该脉冲序列具有容易可逆的特性，这使得在没有松弛的情况下能够进行完美的驱动平衡实验。这种磁化“重新对准”对所有三个部件都有效。因此，整个操作是透明的。支持理论在这里，连同索赔的第一个直接实验证明。实验表明，利用本稳定序列，对于从130度到230度的重聚焦脉冲章动角的范围，确实可以进行完美的重新对准。(C)2011 Elsevier Inc. All rights reserved.
The nCPMG sequence is based on a particular phase modulation of the refocusing pulse train, and was originally designed for rendering the spin echo amplitude insensitive to the initial magnetization phase. This pulse sequence has the peculiarity of being easily invertible, which enables perfect driven equilibrium experiments, in the absence of relaxation. This magnetization 'realignment' is effective for all three components. Hence the overall operation is transparent. Supporting theory is presented here, together with the first direct experimental proof of the claim. The experiment shows that, with the present stabilization sequence, perfect realignment is indeed made possible for a range of refocusing pulse nutation angles from 130 degrees to 230 degrees. (C) 2011 Elsevier Inc. All rights reserved.