Gershenzon Naum I, Kobzar Kyryl, Luy Burkhard, Glaser Steffen J, Skinner Thomas E
Physics Department, Wright State University, Dayton, OH 45435, USA.
J Magn Reson. 2007 Oct;188(2):330-6. doi: 10.1016/j.jmr.2007.08.007. Epub 2007 Aug 16.
An optimal control algorithm for mitigating the effects of T(1) and T(2) relaxation during the application of long pulses is derived. The methodology is applied to obtain broadband excitation that is not only tolerant to RF inhomogeneity typical of high resolution probes, but is relatively insensitive to relaxation effects for T(1) and T(2) equal to the pulse length. The utility of designing pulses to produce specific phase in the final magnetization is also presented. The results regarding relaxation and optimized phase are quite general, with many potential applications beyond the specific examples presented here.
推导了一种用于减轻长脉冲施加期间T(1)和T(2)弛豫效应的最优控制算法。该方法被用于获得宽带激发，这种激发不仅能耐受高分辨率探头典型的射频不均匀性，而且对于等于脉冲长度的T(1)和T(2)弛豫效应相对不敏感。还介绍了设计脉冲以使最终磁化产生特定相位的效用。关于弛豫和优化相位的结果非常普遍，在此处给出的具体示例之外还有许多潜在应用。
