NDLI: Investigation of the correlation between internal gradients and dephasing effect in inhomogeneous field

Content Provider	Springer Nature Link
Author	An, TianLin Xiao, LiZhi Li, Xin Liu, HuaBing Zhang, ZongFu
Copyright Year	2014
Abstract	Internal magnetic gradient plays a significant role in Nuclear Magnetic Resonance (NMR) measurements of fluid saturated porous media. The quantitative characterization and application of this physical phenomenon could effectively improve the accuracy of NMR measurements and interpretations. In this paper, by using the equivalent magnetic dipole method, the three-dimensional distribution of internal induced magnetic field and its gradients in the randomly packed water saturated glass beads are quantitatively characterized. By simulating the diffusive motion of water molecules in porous media with random walk method, the computational dephasing effects equation related to internal gradients is deduced. Thereafter, the echo amplitudes are obtained and the corresponding T $_{2}$-G spectrum is also inverted. For the sake of verifying the simulation results, an experiment is carried out using the Halbach core analyzing system (B $_{0}$=0.18 T, G=2.3 T/m) to detect the induced internal field and gradients. The simulation results indicate the equivalent internal gradient is a distribution of 0.12–0.3 T/m, which matched well with the experimental results.
Starting Page	1676
Ending Page	1683
Page Count	8
File Format	PDF
ISSN	16747348
Journal	Science in China Series G
Volume Number	57
Issue Number	9
e-ISSN	18691927
Language	English
Publisher	Science China Press
Publisher Date	2014-07-05
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	porous media NMR internal gradients dephasing effect inhomogeneous field Physics Classical Continuum Physics Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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