METHOD OF CANCELLING GHOSTS FROM NMR IMAGES

A method of cancelling ghosts from NMR images. The method involves estimating a phase difference function .DELTA. (n.sub.1, n.sub.2) and using that function to solve a linear system of equations to find the magnitudes of the true object densities at the true image and ghost locations x(n.sub.2,n.sub.2) and x(n.sub.1,n.sub.2 +N/2), respectively, where the image has dimensions N.times.N.sub.s. Experimental values of .DELTA. (n.sub.1, n.sub.2) for a variety of objects indicate that its variation along n.sub.1 is considerably larger than along n.sub.2. Thus, for each column n.sub.1, the phase difference function .DELTA. (n.sub.1, n.sub.2) can be modelled as a one-dimensional function of n.sub.2 with two parameters .alpha. (n.sub.1) and .beta. (n.sub.1), which are estimated from the pixels in the 2-D FFT processed reconstructed image Y(n.sub.1,n.sub.2). These parameters are then used to estimate .DELTA. (n.sub.1, n.sub.2), which is ultimately used to de-ghost the image.