Method for Medical Imaging in the Presence of Large Inhomogeneities
Original Publication Date: 1988-Jun-01
Included in the Prior Art Database: 2005-Feb-15
Several methods have been advocated for correcting NMR images for the effects of substantial main field inhomogeneites, for example, [1,2]. These methods use information in the phase of the observed signal to compute corrections. Unfortunately, they can only be used with full-scale three-dimensional imaging, and do not work for planar imaging because one cannot select a plane in the presence of such inhomogeneities. It has been observed that the effects of inhomogeneities on slice selection can be made to cancel much of the affect of the inhomogenities on image reconstruction if a suitable pulse-gradient sequence is applied. The final image is then obtained by simple Fourier inversion without further computed corrections. References 1 E. Feig, F. P. Greenleaf and M. Perlin, Soc. Mag. Reson. Med.