NMR microscopy of dynamic displacements: k-space and q-space imaging

The superposition of pulsed gradient spin-echo (PGSE) and NMR imaging experiments results in a spin density image which is phase and amplitude modulated according to the local self-correlation function for nuclear spin displacements over the time between the PGSE gradient pulses. It is shown that such an experiment can image both static and dynamic spin displacements, the reciprocal space for these image spaces being termed k-space and q-space respectively. Simultaneous imaging of diffusion and flow at microscopic resolution is demonstrated and the Poiseuille velocity distribution agrees well with the velocity map obtained for the motion of water in a 0.7 mm capillary tube.