3D: Sensitivity-enhanced spectra
In principle, two data sets are recorded.
They can be combined in two ways. The result is two sets of slices that differ by 90o degrees
The second slice is subjected to a 90o phase correction (equivalent to a Hilbert transformation) and added to the first slice
As the random noise in a spectrum and its Hilbert transform is statistically independent, adding the two slices above gives the well-known improvement by