Quantitative magnetic resonance flow and diffusion imaging in porous media |
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| Affiliation: | 1. School of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China;2. Department of Ecosystem Science and Management and Materials Research Institute, Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA;1. School of Geography Planning and Environmental Management, University of Queensland, Qld, Australia;2. DSITI, Queensland Government, Qld, Australia;3. Department of Environmental Sciences, Macquarie University, North Ryde, NSW, Australia;4. School of Geography, University of Melbourne, Vic, Australia;1. Dept. of Earth and Planetary Sciences, Macquarie University, Sydney, Australia;2. Laboratoire de Géologie de Lyon, Ecole Normale Supérieure de Lyon, Université Claude Bernard Lyon 1, and CNRS, 69007 Lyon, France |
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| Abstract: | Quantitative flow and diffusion measurements have been made for water in model porous media, using magnetic resonance micro-imaging methods. The samples consisted of compacted glass beads of various sizes down to 1 mm diameter. Typical flow and diffusion images exhibited a spatial resolution of 117 μm × 117 μm and velocities in the range 1–2 mm/s. Comparison of volume flow rates calculated from the flow velocity maps with values measured directly yielded good agreement in all cases. There was also good agreement between the mean diffusion coefficient of water calculated from the diffusion maps and the bulk diffusion coefficient for pure water at the same temperature. In addition, the mean diffusion coefficient did not depend on the pore sizes in the bead diameter range of 1–3 mm. Our results also show that partial volume effects can be compensated by appropriate thresholding of the images prior to the final Fourier transformation in the flow-encoding dimension. |
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