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A Simple Approach for Ultraclean Multisite Selective Excitation Using Excitation Sculpting

1998; Elsevier BV; Volume: 135; Issue: 1 Linguagem: Inglês

10.1006/jmre.1998.1494

1096-0856

Teodor Parella, Francisco Sánchez‐Ferrando, Albert Virgili,

Magnetic properties of thin films

Existing optimal control protocols for mitigating the effects of relaxation and/or RF inhomogeneity on broadband pulse performance are extended to the more difficult problem of designing robust, refocused, frequency selective excitation pulses. For the demanding case of T1 and T2 equal to the pulse length, anticipated signal losses can be significantly reduced while achieving nearly ideal frequency selectivity. Improvements in performance are the result of allowing residual unrefocused magnetization after applying relaxation-compensated selective excitation by optimized pulses (RC-SEBOPs). We demonstrate simple pulse sequence elements for eliminating this unwanted residual signal.