Abstract
Spin-spin lattice relaxation times T2 have been measured since 1950 with the use of the spin echo method. Since then, several modifications have been introduced in order to overcome technical difficulties. T2 measurement by the CPMG method has become very popular, but its performance is sensitive to the ratio T2/τ, where τ is the time between pulses. The spin locking technique gives good results but is not normally available in conventional spectrometers. Recently, a new way of measuring T2 was proposed for the case of proton NMR, which one performs by applying a continuous saturating field B2 to the observed nuclei with different offsets, waiting 5T1 between pulses until the spin system has reached equilibrium. The resulting Mz values are matched to the stationary solution of the Bloch equation. Consequently, the T2 values are obtained.
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