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• W2091257161 abstract "Within the past decade, 2D Laplace nuclear magnetic resonance (NMR) has been developed to analyze pore geometry and diffusion of fluids in porous media on the micrometer scale. Many objects like rocks and concrete are heterogeneous on the macroscopic scale, and an integral analysis of microscopic properties provides volume-averaged information. Magnetic resonance imaging (MRI) resolves this spatial average on the contrast scale set by the particular MRI technique. Desirable contrast parameters for studies of fluid transport in porous media derive from the pore-size distribution and the pore connectivity. These microscopic parameters are accessed by 1D and 2D Laplace NMR techniques. It is therefore desirable to combine MRI and 2D Laplace NMR to image functional information on fluid transport in porous media. Because 2D Laplace resolved MRI demands excessive measuring time, this study investigates the possibility to restrict the 2D Laplace analysis to the sum signals from low-resolution pixels, which correspond to pixels of similar amplitude in high-resolution images. In this exploratory study spatially resolved D–T2 correlation maps from glass beads and mortar are analyzed. Regions of similar contrast are first identified in high-resolution images to locate corresponding pixels in low-resolution images generated with D–T2 resolved MRI for subsequent pixel summation to improve the signal-to-noise ratio of contrast-specific D–T2 maps. This method is expected to contribute valuable information on correlated sample heterogeneity from the macroscopic and the microscopic scales in various types of porous materials including building materials and rock." @default.
• W2091257161 created "2016-06-24" @default.
• W2091257161 creator A5079954937 @default.
• W2091257161 creator A5086664284 @default.
• W2091257161 date "2014-05-01" @default.
• W2091257161 modified "2023-10-12" @default.
• W2091257161 title "Spatially resolved D–T2 correlation NMR of porous media" @default.
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• W2091257161 doi "https://doi.org/10.1016/j.jmr.2014.01.017" @default.
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