Saturation-recovery as a T 1 -filter for T 2 -T 2 exchange NMR.

The Inversion-Recovery (IR) technique has already been proposed to be used as a T1 -filter for T2 -T2 Exchange experiments. However, when the Exchange experiments are employed for studying samples that show T1 distributions, where the pools are defined by broad relaxation time distributions, e.g. porous media, IR might be difficult to be used as a filter. This paper presents the difficulties found when using IR and proposes the use of Saturation-Recovery (SR) technique as an alternative to T1 -filter.