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Cho, Hyungjoon
Biomedical Imaging Science and Engineering Lab(BISE)
Research Interests
  • Imaging tumor microenvironments, susceptibility contrast based MR structural imaging, ultra fast acquisitions of dynamic MR, algorithm/Hardware development for magnetic particle imaging

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Magnetic Resonance Characterization of Porous Media Using Diffusion through Internal Magnetic Fields

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Title
Magnetic Resonance Characterization of Porous Media Using Diffusion through Internal Magnetic Fields
Author
Cho, HyungjoonSigmund, Eric E.Song, Yiqiao
Keywords
Convection-diffusion equations; Singular perturbation analysis; Boundary layers; Characteristic points; Compatibility conditions
Issue Date
2012-04
Publisher
MDPI AG
Citation
MATERIALS, v.5, no.4, pp.590 - 616
Abstract
When a porous material is inserted into a uniform magnetic field, spatially varying fields typically arise inside the pore space due to susceptibility contrast between the solid matrix and the surrounding fluid. As a result, direct measurement of the field variation may provide a unique opportunity to characterize the pore geometry. The sensitivity of nuclear magnetic resonance (NMR) to inhomogeneous field variations through their dephasing effects on diffusing spins is unique and powerful. Recent theoretical and experimental research sheds new light on how to utilize susceptibility-induced internal field gradients to quantitatively probe the microstructure of porous materials. This article reviews ongoing developments based on the stimulated echo-pulse sequence to extend the characterization of porous media using both spatially resolved and unresolved susceptibility-induced internal gradients that operate on a diffusing-spin ensemble.
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DOI
10.3390/ma5040590
ISSN
1996-1944
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SLS_Journal Papers
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