Linear phase slope in pulse design: Application to coherence transfer
Linear phase slope in pulse design: Application to coherence transfer
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DOI：
10.1016/j.jmr.2008.02.021
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发表时间：
2008-06-01
影响因子：
2.2
通讯作者：
Glaser, Steffen J.
中科院分区：
文献类型：
--
作者：
Gershenzon, Naum I.;Skinner, Thomas E.;Glaser, Steffen J.
使用最优控制方法，可以设计具有定义的线性相位色散的鲁棒宽带激励脉冲。应用包括与不需要相位校正的等效脉冲相比，对于给定脉冲长度增加的带宽、选择性脉冲和减轻弛豫效应的脉冲。这也使得可以产生与理想硬脉冲等效的脉冲，该脉冲之后是有效的演化周期。例如，在激励脉冲之后是恒定延迟的应用中，例如对于异质耦合的演变，脉冲持续时间的一部分可以被吸收在现有延迟中，从而显著减少长的、高度鲁棒的脉冲的时间开销。我们将具有定义的线性相位色散的这种激发脉冲的类别称为ICEBERG脉冲（导致恒定相位色散的固有相干演化优化宽带激发）。的激励脉冲的相位色散的激励效率的依赖性的系统研究，这揭示了令人惊讶的机会，改善脉冲序列的性能。(c)2008年爱思唯尔公司All rights reserved.
Using optimal control methods, robust broadband excitation pulses can be designed with a defined linear phase dispersion. Applications include increased bandwidth for a given pulse length compared to equivalent pulses requiring no phase correction, selective pulses, and pulses that mitigate the effects Of relaxation. This also makes it possible to create pulses that are equivalent to ideal hard pulses followed by an effective evolution period. For example, in applications, where the excitation pulse is followed by a constant delay, e.g. for the evolution of heteronuclear couplings, part of the pulse duration can be absorbed in existing delays, significantly reducing the time overhead of long, highly robust pulses., We refer to the class of such excitation pulses with a defined linear phase dispersion as ICEBERG pulses (inherent Coherence Evolution optimized Broadband Excitation Resulting in constant phase Gradients). A systematic study of the dependence of the excitation efficiency on the phase dispersion of the excitation pulses is presented, which reveals surprising opportunities for improved pulse sequence performance. (c) 2008 Elsevier Inc. All rights reserved.