Pattern pulses: design of arbitrary excitation profiles as a function of pulse amplitude and offset
Pattern pulses: design of arbitrary excitation profiles as a function of pulse amplitude and offset
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DOI：
10.1016/j.jmr.2004.12.005
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发表时间：
2005-04-01
影响因子：
2.2
通讯作者：
Glaser, SJ
中科院分区：
文献类型：
--
作者：
Kobzar, K;Luy, B;Glaser, SJ
提出了一类新的脉冲，它可以看作是频率选择脉冲和B-1选择脉冲的推广。这些脉冲的激励分布在由脉冲偏移量和射频(RF)幅度跨越的两个维度上形成预定义图案。提出的脉冲是基于最优控制理论的原理进行数值设计的。对于简单的测试模式，我们通过模拟和实验证明了该方法的灵活性。这种以前未知的灵活性可能会在核磁共振波谱和成像方面引发新的应用。作为第一个实际应用，我们演示了一种校准RF脉冲的直接方法。(C)2004 Elsevier Inc.保留所有权利。
A novel class of pulses is presented which can be regarded as a generalization of both frequency-selective pulses and B-1-selective pulses. The excitation profile of these pulses forms a pre-defined pattern in two dimensions, which are spanned by pulse offset and radio-frequency (RF) amplitude. The presented pulses were designed numerically based on principles of optimal control theory. For simple test patterns, we demonstrate the flexibility of this approach by simulations and experiments. This previously unknown flexibility may trigger novel applications in NMR spectroscopy and imaging. As a first practical application, we demonstrate a direct approach for calibrating RF pulses. (c) 2004 Elsevier Inc. All rights reserved.