Methods of imaging solids by NMR techniques.

摘要

A sequence of a pair of r.f. pulses (90x DEG and 90y DEG ) is applied to a solid being imaged with a time interval ( tau ) after each pulse. A static magnetic field is maintained and a magnetic gradient field is superimposed in the said time intervals, the time integrals of the gradient magnitudes of the gradient fields being equal. A free induction solid echo signal is detected at the end of the second time interval. The sequence is repeated for different values of the time integral are to obtain a set of signals and Fourier transformations with respect to the said time integral are then carried out on the set to obtain one-dimensional information. Two-dimensional information can be obtained from a plurality of sets of signals, each set being obtained in the presence of an additional orthogonal gradient field of differing value for each set.