Assessing signal enhancement in distant dipolar field-based sequences.
The possibility of improving the signal-to-noise efficiency of NMR signal refocused by long-range dipolar interactions has been discussed recently [R.T. Branca, G. Galiana, W.S. Warren, Signal enhancement in CRAZED experiments, J. Magn. Reson. 187 (2007) 38-43]. For systems where T(1)>>T(2), 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 T(1) relaxation. Here, we use analytical calculations to investigate the source of this improved signal and determine the maximum enhancement provided by the method.
Barros
Wilson
W
Vanderbilt University Medical Center, Institute of Imaging Science, AA-1105 MCN, Nashville, TN 37232-2310, USA. wilson.barros@vanderbilt.edu
Gochberg
Daniel F
DF
Gore
John C
JC
D000465:Algorithms; D004574:Electromagnetic Fields; D007091:Image Processing, Computer-Assisted; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D015233:Models, Statistical