Assessing signal enhancement in distant dipolar field-based sequences

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• 作者：Wilson Barros Jr. ; Daniel F. Gochberg ; John C. Gore
• 关键词：Distant dipolar field ; Intermolecular multiple-quantum coherences ; Stimulated echo ; Long-range dipolar interactions ; Signal enhancement ; CRAZED
• 刊名：Journal of Magnetic Resonance
• 出版年：2007
• 出版时间：November 2007
• 年：2007
• 卷：189
• 期：1
• 页码：32-37
• 全文大小：1454 K

文摘

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 T₁ f"" alt=""much greater-than"" border=0> 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.