Abstract

Spin-spin lattice relaxation times <i>T</i><sub>2</sub> 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. <i>T</i><sub>2</sub> measurement by the CPMG method has become very popular, but its performance is sensitive to the ratio <i>T</i><sub>2</sub>/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 <i>T</i><sub>2</sub> was proposed for the case of proton NMR, which one performs by applying a continuous saturating field <i>B</i><sub>2</sub> to the observed nuclei with different offsets, waiting 5<i>T</i><sub>1</sub> between pulses until the spin system has reached equilibrium. The resulting <i>M</i><sub><i>z</i></sub> values are matched to the stationary solution of the Bloch equation. Consequently, the <i>T</i><sub>2</sub> values are obtained.

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