RD MRI of flow of HP 129Xe through a rock sample. (a) The rock sample
is inside a large RF coil used to encode spatial information into spin
coherences, and the signal is read out by a smaller and more sensitive coil
around the outlet tubing, with optimized filling factor. (b) 3D TOF images. The
silhouettes represent the rock sample. TOF, i.e., the time
instant the signal is detected after the encoding, is shown above the images.
Reprinted with permission from Granwehr, J.; Harel, E.; Han, S.; Garcia, S.;
Pines, A.; Sen, P. N.; Song, Y. Q. Phys. Rev. Lett.
95, 075503 (2005). Copyright (2005) by the American Physical
Society.