Efficient high-resolution RF pulse design applied to simultaneous multi-slice excitation
Efficient high-resolution RF pulse design applied to simultaneous multi-slice excitation
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DOI：
10.1016/j.jmr.2015.11.013
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发表时间：
2016-02-01
影响因子：
2.2
通讯作者：
Stollberger, Rudolf
中科院分区：
文献类型：
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作者：
Aigner, Christoph Stefan;Clason, Christian;Stollberger, Rudolf
经由最优控制的RF脉冲设计通常基于梯度和拟牛顿方法，因此收敛缓慢。我们提出了一个灵活和高效的方法，使用精确的二阶信息内的全局收敛的信赖域CG-牛顿方法，以提高收敛速度。该方法适用于设计的RF脉冲的单和同时多切片（SMS）的激励和验证使用幻影和体内实验上的3 T扫描仪使用修改后的梯度回波序列。(C)2015 Elsevier Inc. All rights reserved.
RF pulse design via optimal control is typically based on gradient and quasi-Newton approaches and therefore suffers from slow convergence. We present a flexible and highly efficient method that uses exact second-order information within a globally convergent trust-region CG-Newton method to yield an improved convergence rate. The approach is applied to the design of RF pulses for single- and simultaneous multi-slice (SMS) excitation and validated using phantom and in vivo experiments on a 3 T scanner using a modified gradient echo sequence. (C) 2015 Elsevier Inc. All rights reserved.