磁非均匀介质中的横向NMR弛豫
Transverse NMR relaxation in magnetically heterogeneous media
摘要：
我们认为，从一个渗透性介质的NMR信号与非均匀拉莫尔频率分量，在一个规模上变化的自旋载流子扩散长度。我们专注于横向弛豫的介观部分，这是由于在扩散运动过程中积累的自旋的进动相的分散而发生的。通过将谱线形状与空间变化的拉莫尔频率的关联函数相关联，我们演示了如何从NMR谱确定拉莫尔频率分布的关联长度和方差。我们通过数值模拟证实了我们的结果，并将其应用于量化人体血液光谱。
英文摘要：
We consider the NMR signal from a permeable medium with a heterogeneous Larmor frequency component that varies on a scale comparable to the spin-carrier diffusion length. We focus on the mesoscopic part of the transverse relaxation, that occurs due to dispersion of precession phases of spins accumulated during diffusive motion. By relating the spectral lineshape to correlation functions of the spatially varying Larmor frequency, we demonstrate how the correlation length and the variance of the Larmor frequency distribution can be determined from the NMR spectrum. We corroborate our results by numerical simulations, and apply them to quantify human blood spectra.
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