Assessing signal enhancement in distant dipolar field-based sequences
Wilson Barros Jr., Daniel F. Gochberg and John C. Gore
Abstract
The possibility of improving the signal-to-noise efficiency of NMR signal refocused by long-range dipolar interactions has been discussed recently [Branca et al., JMR 187 (2007) 38-43]. For systems where T1<< T2, by including an extra radio-frequency pulse in a standard CRAZED sequence, it is possible to increase the available signal by exploiting its sensitivity to T1 relaxation. Here, we use analytical calculations to investigate the source of this improved signal and determine the maximum enhancement provided by the method.
Abstract
The possibility of improving the signal-to-noise efficiency of NMR signal refocused by long-range dipolar interactions has been discussed recently [Branca et al., JMR 187 (2007) 38-43]. For systems where T1<< T2, by including an extra radio-frequency pulse in a standard CRAZED sequence, it is possible to increase the available signal by exploiting its sensitivity to T1 relaxation. Here, we use analytical calculations to investigate the source of this improved signal and determine the maximum enhancement provided by the method.
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