NMR-based diffusion lattice imaging.
NMR-based diffusion lattice imaging.
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基于核磁共振的扩散晶格成像
DOI：
10.1103/physreve.93.032401
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Kuder TA
中科院分区：
文献类型：
--
作者：
Laun FB;Müller L;Kuder TA
核磁共振扩散实验得到了阻碍扩散过程的结构的信息，例如细胞膜的信息，因此得到了广泛的应用。虽然最近的文章表明，这些实验可以用来确定在感兴趣的体积上平均的闭合气孔的形状，但在开放的、连接良好的系统中可以获得多少信息仍然是一个悬而未决的问题。在这一理论工作中，证明了连通周期系统的全部结构信息是可访问的。为此，使用了所谓的通过脉冲场梯度编码N个时间间隔的顺序重相(SERPENT)序列，该序列使用了几个扩散编码具有不同幅度的梯度脉冲。考虑了两个被核磁共振可见介质包围的二维固体矩阵：六角形的柱面格子和矩形的等腰三角形格子。
Nuclear magnetic resonance (NMR) diffusion experiments are widely employed as they yield information about structures hindering the diffusion process, e.g., about cell membranes. While it has been shown in recent articles that these experiments can be used to determine the shape of closed pores averaged over a volume of interest, it is still an open question how much information can be gained in open well-connected systems. In this theoretical work, it is shown that the full structure information of connected periodic systems is accessible. To this end, the so-called “SEquential Rephasing by Pulsed field-gradient Encoding N Time intervals” (SERPENT) sequence is used, which employs several diffusion encoding gradient pulses with different amplitudes. Two two-dimensional solid matrices that are surrounded by an NMR-visible medium are considered: a hexagonal lattice of cylinders and a rectangular lattice of isosceles triangles.