Resolution of NMR chemical shift images into real and imaginary components

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Abstract
Fast chemical shift imaging of two-line materials is described using a modified spin-echo sequence. The method resolves the two chemical shift images into real and imaginary components representing the reconstructed image. The measuring time is reduced to half of that for the conventional method proposed by Dixon et al. (see Radiol., vol.153, p.189, 1984) and quantitative evaluation of the images becomes possible. Reference material with a single resonant line is used to eliminate the phase error caused by static field inhomogeneity and the inherent apparatus offset phase. Experiments are conducted using acetone and benzene with a medium-bore superconductive magnet operating at 0.5 T. From these experiments, two chemical shift images are obtained. These images are then superimposed to produce a conventional density image.