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Purpose
The frequency‐swept pulse known as the hyperbolic‐secant (HS) pulse is popular in NMR for achieving adiabatic spin inversion. The HS pulse has also shown utility for achieving excitation and refocusing in gradient‐echo and spin‐echo sequences, including new ultrashort echo‐time imaging (e.g., Sweep Imaging with Fourier Transform, SWIFT) and B1 mapping techniques. To facilitate the analysis...
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