Fourier transform indirect relaxation

In addition, transverse relaxation, which occurs during the pulse sequence, will result in smaller peak intensities for increasing values of tx, so that cross sections of the -transformed data (F2) have the form of exponentially decreasing sinusoids (cf. FIDs). A Fourier transformation of these cross sections (i.e., with respect to q) thus yields a planar spectrum with two frequency dimensions (F2 and Fx, termed the directly detected and indirectly detected dimensions, respectively) where, in most homonuclear 2D experiments, the ID spectrum... 

Both direct and Indirect methods have been used to measure deuterium relaxation (2) the Inversion-recovery or partially relaxed Fourier transform method Is most widely employed. 

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