Abstract
Because of the importance of time-saving methods in T 1 experiments, the influence of the pulse delay time T in fast inversion-recovery sequences ( T, π, t, π/2) n T > 0.3 T 1 and the influence of the inhomogeneity of the radiofrequency field, owing to big sample volume, on relaxation times are studied. In order to eliminate these effects on calculated T 1, a least-squares procedure which fits a generalized relaxation function to the experimental data is used. The generalized function which takes into account the inhomogeneity of H 1 and the pulse delay T is deduced from Bloch's equations. It is shown with 13C relaxation data that a fast pulse sequence T ⩾ 2 T 1 can be used without introducing a significant systematic error in calculated T 1.
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