应用于同时多切片激励的高效高分辨率RF脉冲设计
Efficient high-resolution RF pulse design applied to simultaneous multi-slice excitation
摘要:
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,以产生一个改进的收敛速度。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的3T扫描仪使用修改后的梯度回波序列。
英文摘要:
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 3T scanner using a modified gradient echo sequence.
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