A noniterative method to design large-tip-angle multidimensional spatially-selective radio frequency pulses for parallel transmission.

摘要: Recently, theoretical and experimental work has shown that parallel transmission of RF pulses can be used to shorten the duration multidimensional spatially-selective compensate for B1 field inhomogeneity. However, all existing noniterative methods design only excitation with a small flip angle (e.g., 30°, or at most 90°) cannot large-tip-angle inversion/refocusing pulses, because these are based on small-tip-angle (STA) approximation Bloch equation. In this work, method is proposed, an extension single-channel linear-class (LCLTA) theory. Design examples 2D refocusing inversion transmit magnetization profiles from equation simulations demonstrate strength proposed method. A spin-echo experiment slab phantom using 180° pulse eight-channel transmit-only array further validates effectiveness Magn Reson Med 58:326–334, 2007. © 2007 Wiley-Liss, Inc.