Abstract
Broadband composite inversion pulses using coherent frequency switching were designed by searching for conditions which localize and compensate for the effect of 180° pulses in offset frequency. They are composed of a few pulses which have flip angles close to 180° but differ in frequency by about 1.5 γB 1, where B 1 indicates the amplitude of the RF field. The efficient frequency ranges of the composite inversion pulses are proportional to the number of frequencies used. Next, the performance and tolerance of RF field inhomogeneity were improved by concatenating the five inversion pulses using a phase cycle of [0°, 150°, 60°, 150°, 0°]. Finally, broadband decoupling sequences were constructed out of these improved inversion pulses using the phase cycle employed in MLEV. The performance of these pulse sequences was tested experimentally.
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