Kobzar Kyryl, Luy Burkhard, Khaneja Navin, Glaser Steffen J
Department of Chemistry, Technische Universität München, Lichtenbergstr. 4, 85747 Garching, Germany.
J Magn Reson. 2005 Apr;173(2):229-35. doi: 10.1016/j.jmr.2004.12.005.
A novel class of pulses is presented which can be regarded as a generalization of both frequency-selective pulses and B1-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.
提出了一类新型脉冲，它可被视为频率选择脉冲和B1选择脉冲的推广。这些脉冲的激发轮廓在由脉冲偏移和射频（RF）幅度所跨越的二维空间中形成预定义模式。所提出的脉冲是基于最优控制理论原理通过数值方法设计的。对于简单的测试模式，我们通过模拟和实验展示了这种方法的灵活性。这种前所未知的灵活性可能会引发核磁共振光谱学和成像领域的新应用。作为第一个实际应用，我们展示了一种校准射频脉冲的直接方法。
