Communication
Spatially selective radiofrequency pulses

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  • Dual-compensated antisymmetric composite refocusing pulses for NMR

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    Therefore much of the thrust of composite pulse research has been to find sequences which, relative to a single pulse, are broadband with respect to the frequency parameters ω1 = |−γB1| or Ω. Such composite pulses can be said to be compensated for the relevant imperfections [1–18]. Broadband composite 180° pulses have always been of particular interest as both inversion of longitudinal (z) magnetization and refocusing of transverse (x, y) magnetization are very sensitive to the common pulse imperfections.

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    It is therefore predicted not to work well as a single refocusing element. A more sophisticated broadband composite 180° pulse is 180°120°180°240°180°120° (designated here TS) [5,8]. This is also designed to compensate for B1 inhomogeneity but also to have an overall rotation axis along the rotating-frame x axis across its usable bandwidth.

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