The diversity of B-0 and B-1 gradient NMR diffusometry techniques

The conventional pulsed gradient Hahn or stimulated echo methods for diffusion measurements are briefly reviewed. Compared to these techniques, unconventional NMR diffusometry variants based on gradients of the amplitude of the radio frequency field, on nonlinear (or multiple) echoes, and on imaging techniques open promising aspects depending on the application envisaged. A series of typical pulse sequences representing the diversity of NMR diffusometry methods is described and discussed with respect to advantages and disadvantages.