Transverse NMR relaxation as a probe of mesoscopic structure
Transverse NMR relaxation as a probe of mesoscopic structure
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DOI：
10.1103/physrevlett.89.278101
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发表时间：
2002-12-30
影响因子：
8.6
通讯作者：
Novikov, DS
中科院分区：
文献类型：
--
作者：
Kiselev, VG;Novikov, DS
横向核磁共振弛豫在宏观样品中示出的介观磁化率变化的结构是非常敏感的。这种灵敏度被提出作为NMR测量中的一种新的对比度。对于悬浮液的任意形状的顺磁性物体，横向弛豫的情况下，发现一个小的个别对象的退相效果。强烈的弛豫速率对物体形状的依赖性与对全血的实验一致。已证明的结构敏感性是在多孔介质、生物系统中的NMR弛豫以及扩散限制反应的动力学中产生的一般效应。
Transverse NMR relaxation in a macroscopic sample is shown to be extremely sensitive to the structure of mesoscopic magnetic susceptibility variations. Such a sensitivity is proposed as a novel kind of contrast in the NMR measurements. For suspensions of arbitrary-shaped paramagnetic objects, the transverse relaxation is found in the case of a small dephasing effect of an individual object. Strong relaxation rate dependence on the objects' shape agrees with experiments on whole blood. Demonstrated structure sensitivity is a generic effect that arises in NMR relaxation in porous media, biological systems, as well as in kinetics of diffusion limited reactions.