AN ANALYTICAL FORM DESCRIBING T-2 DISPERSIONS RESULTING FROM DIFFUSIVE EXCHANGE

Dispersions in the H-1 T-2 (Carr-Purcell-Meiboom-Gill) relaxation beha viour analogous to those well known to result from chemical exchange h ave been generated by numerical simulations of fast diffusive exchange between two spatially resolved regions having distinct NMR parameters . These resultant curves have been successfully fitted to a Carver-Ric hards functional form. Hence, apparent exchange rates and geometry-dep endent scaling factors of the frequency difference between regions hav e been extracted, which allow dispersions arising from spatially heter ogeneous systems to be described by a two-site exchange model.