Correlation of the inhomogeneous field as a measure of sample heterogeneity

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• 作者：Lauren M. Burcaw^a ; ^{lauren.burcaw@nih.gov} ; Paul T. Callaghan^b
• 关键词：Porous media ; 2D correlation ; Inhomogeneous fields ; Transverse relaxation ; Internal field gradients
• 刊名：Journal of Magnetic Resonance
• 出版年：2012
• 期刊代码：126_10907807
• 类别：ch
• 出版时间：March, 2012
• 卷：216
• 期：Complete
• 页码：144-151
• 文件大小：947 K

摘要

In this paper we present a method to determine the pore and grain size heterogeneity using a correlation between the transverse relaxation time and the susceptibility induced inhomogeneous magnetic field. By using a CPMG echo train, we are able to correlate T₂ with the inhomogeneous internal magnetic field, . We first introduce a simple simulation to study the correlation between the internal magnetic field gradient, 鈭?em>g鈭? and , where this correlation is analogous to the T₂- correlation with horizontal inversion. We then acquire experimental data from two samples, one a simple bead pack, and the other a more complicated sandstone rock core. We find that indeed this method can indicate the presence of pore and grain size heterogeneities in the sample.