A General approach to T 2 measurements in the presence of internal gradients
A General approach to T 2 measurements in the presence of internal gradients
复制标题
存在内部梯度时 T 2 测量的通用方法
DOI：
10.1016/j.micromeso.2013.03.050
复制
发表时间：
2013
影响因子：
5.2
通讯作者：
Mitchell J
中科院分区：
文献类型：
--
作者：
Mitchell J
在多孔材料的核磁共振（NMR）分析中，由固体表面和孔隙中的吸入流体之间的磁化率差异引起的内部梯度是经常遇到的限制。已知这些内部梯度的强度与磁场强度B0成比例，并且它们的存在阻止了横向T2弛豫时间、图像强度和扩散系数的定量测定。本文提出了一种确定含内梯度液体饱和多孔介质T2弛豫时间分布的一般方法。我们的方法是证明使用水饱和的玻璃珠包在一个中间的场强B0=2T，虽然该技术适用于广泛的多孔介质中发现的自然和工业（岩石，土壤，水泥，催化剂），从而使这些材料在以前被认为是不合适的场强进行研究。
Internal gradients, caused by the magnetic susceptibility difference between the solid surface and imbibed fluids in pores, are a frequently encountered limitation in nuclear magnetic resonance (NMR) analysis of porous materials. The strength of these internal gradients are known to scale with magnetic field strength B0and their presence prevents quantitative determination of transverse T2relaxation times, image intensities, and diffusion coefficients. We present a general method for determining “true” T2relaxation time distributions of liquid saturated porous media in the presence of internal gradients. Our method is demonstrated using water saturated glass bead packs at an intermediate field strength B0=2T, although the technique is applicable to the wide range of porous media found in nature and industry (rocks, soils, cements, catalysts), thereby allowing these materials to be studied at field strengths previously considered to be inappropriate.