PARAMETER RELATIONS FOR THE SHINNAR-LEROUX SELECTIVE EXCITATION PULSE DESIGN ALGORITHM
PARAMETER RELATIONS FOR THE SHINNAR-LEROUX SELECTIVE EXCITATION PULSE DESIGN ALGORITHM
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DOI：
10.1109/42.75611
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发表时间：
1991-03-01
影响因子：
10.6
通讯作者：
MACOVSKI, A
中科院分区：
文献类型：
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作者：
PAULY, J;LEROUX, P;MACOVSKI, A
在磁共振成像（MRI）中使用选择性激励脉冲来隔离通过受试者的特定切片。由于布洛赫方程的非线性，脉冲设计问题通常是非线性的。最近，Shinnar和他的同事[1]-[6]和Le Roux[7]-[9]提出了一个直接的解决方案。在本文中，我们首先介绍了Shinnar-Le Roux （SLR）算法的概述。然后，我们展示了如何非常精确地解析指定单反脉冲的性能。这是很有用的，因为它告诉我们如何设计一个脉冲来产生指定的切片轮廓。更重要的是，它允许脉冲设计者分析地权衡描述脉冲性能的参数。我们将提供几个示例来说明更重要的权衡。这些脉冲包括线性相位脉冲、最小相位脉冲和最大相位脉冲。线性相位脉冲可以通过梯度反转重新聚焦，并且可以用作自旋回波脉冲。最小和最大相位脉冲具有更好的切片轮廓，但不能完全重新聚焦。
Selective excitation pulses are used in magnetic resonance imaging (MRI) to isolate a specific slice through the subject. The pulse design problem is in general nonlinear due to the nonlinearity of the Bloch equation. Recently a direct solution has been proposed by Shinnar and his co-workers [1]-[6], and Le Roux [7]-[9].In this paper we first present an overview of the Shinnar-Le Roux (SLR) algorithm. We then show how the performance of SLR pulses can be very accurately specified analytically. This is useful because it tells how to design a pulse that produces a specified slice profile. More importantly, it allows the pulse designer to trade-off analytically the parameters describing the pulse performance. We present several examples to illustrate the more important trade-offs. These include linear-phase and minimum- and maximum-phase pulses. Linear-phase pulses can be refocused with a gradient reversal, and can be used as spin-echo pulses. Minimum- and maximum-phase pulses have better slice profiles, but cannot be completely refocused.