β Scribed by H. Robert; D. Pusiol
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A new technique for two-dimensional rotating-frame nuclearimages of a macroscopic sample by means of NQR is requadrupole-resonance imaging in powder or polycrystalline samported. The bidimensional rotating-frame imaging technique ples is reported. The bidimensional encoding procedure is based (2D rNQRI) is based on the application of a sequence of on the irradiation of the object by a sequence of pulsed orthogonal pulsed orthogonal RF linear gradients to the sample. The radiofrequency linear gradients. The spatial-density function, tospatial spin-density function is then directly reconstructed gether with the spectroscopic information, is directly recorded in by a two-dimensional data-evaluation procedure.
One of the important features of the 2D or 3D encoding are discussed, and experimental results demonstrating the viability procedures is the way in which the sample points are distribof the technique are given. α§ 1997 Academic Press uted (7, 8). In the image reconstruction from projections, a polar sampling is applied so that the low-spatial-frequency components are obtained with higher precision than the high-
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## Abstract The reconstruction of twoβdimensional spatial images with 0.5βmm resolution using radio frequency gradients generated by an NMR coil system rotated about the sample is demonstrated for ^23^Na. The method retains chemical shift, should be capable of mapping __T__~1~ and __T__~2~ informat
The rotating-frame method of localization for spatially resolved spectroscopy and imaging in the pure quadrupole regime relies on a gradient B 1 field in which spins experience a flip angle dependent on their position in the B 1 field strength. So far, the techniques have been implemented as amplitu