Chemical‐Shift Imaging

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Abstract
The echo-planar shift mapping (EPSM) technique, a variant of echo-planar imaging (EPI), is evaluated with theoretical studies using computer simulations and with experimental studies using fluorine resonances in phantoms. In situations where the signal-to-noise ratio permits, it is shown that EPSM can produce in a few seconds chemical-shift spectra at all points in a specified spin-density image corresponding to a selected slice. Applications of this technique are likely to be for proton and fluorine chemical-shift measurements and rapid studies of magnetic field inhomogeneities produced by magnet nonalignment and field shifts around magnetic materials.© 1985 Academic Press,Inc.© 1985 Academic Press,Inc.

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