2-DIMENSIONAL FOURIER-TRANSFORM NMR IMAGING OF SOLIDS USING LARGE OSCILLATING FIELD GRADIENTS

We demonstrate a simple gradient echo technique for the NMR imaging of short T2 materials in which large oscillating field gradients are used to provide adequate resolution. The technique involves the use of oscillating gradients with frequencies omega and omega/2 and, with suitable correction for nonlinear sampling, is shown to be capable of covering k space in a manner similar to phase and frequency encoding in standard 2DFT. An acceptable two-dimensional F-19 image of a 6 mm diameter phantom of PTFE (T2 approximately 60-mu-s) of 4 mm length was obtained in 26 min.