Rapid encoding of T

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• 作者：T.C. Ch ; rasekera ; J. Mitchell ; E.J. Fordham ; L.F. Gladden ; M.L. Johns
• 关键词：Relaxation correlations ; Relaxation exchange ; Laplace inversions ; Broad line samples ; Porous media ; Permeable rocks ; Cellulose fibres
• 刊名：Journal of Magnetic Resonance
• 出版年：2008
• 出版时间：September 2008
• 年：2008
• 卷：194
• 期：1
• 页码：156-161
• 全文大小：263 K

文摘

Nuclear magnetic resonance (NMR) T₁ relaxation times have been encoded in the second dimension of two-dimensional relaxation correlation and exchange experiments using a rapid “double-shot” T₁ pulse sequence. This technique also retains chemical shift information (δ) for short materials. In this way, a spectral dimension can be incorporated into a T₂–T₁–δ correlation without an increase in experimental time compared to the conventional, chemically insensitive T₁–T₂ correlation. Here, the T₂–T₁–δ pulse sequence is used to unambiguously identify oil and water fractions in a permeable rock. A novel T₁–T₁–(δ) relaxation exchange measurement is also introduced and used to observe diffusive exchange of water in cellulose fibres.