Spatial mapping of the chemical shift in NMR

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Abstract
Two new variants of the echo-planar (EP) NMR imaging method are proposed which allow both spin density and chemical shift in a defined plane to be simultaneously observed and unambiguously extricated. Echo-planar shift mapping (EPSM) is a very fast method taking only four separate experiments to produce the map, and has snapshot potential. The hybrid projection reconstruction echo-planar (PREP) method is somewhat slower but has the advantage of relative simplicity. Both methods offer advantages in speed over three- or four-dimensional Fourier transform techniques for spatial chemical shift mapping.

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