Article (Scientific journals)
Magnetic Resonance Imaging of Water Content and Flow Processes in Natural Soils by Pulse Sequences with Ultrashort Detection.
Haber-Pohlmeier, Sabina; Caterina, David; Blümich, Bernhard et al.
2021In Molecules, 26 (17), p. 5130
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Keywords :
fast relaxation times; magnetic resonance imaging; natural soil material; water content; water flow; Analytical Chemistry; Chemistry (miscellaneous); Molecular Medicine; Pharmaceutical Science; Drug Discovery; Physical and Theoretical Chemistry; Organic Chemistry
Abstract :
[en] Magnetic resonance imaging is a valuable tool for three-dimensional mapping of soil water processes due to its sensitivity to the substance of interest: water. Since conventional gradient- or spin-echo based pulse sequences do not detect rapidly relaxing fractions of water in natural porous media with transverse relaxation times in the millisecond range, pulse sequences with ultrafast detection open a way out. In this work, we compare a spin-echo multislice pulse sequence with ultrashort (UTE) and zero-TE (ZTE) sequences for their suitability to map water content and its changes in 3D in natural soil materials. Longitudinal and transverse relaxation times were found in the ranges around 80 ms and 1 to 50 ms, respectively, so that the spin echo sequence misses larger fractions of water. In contrast, ZTE and UTE could detect all water, if the excitation and detection bandwidths were set sufficiently broad. More precisely, with ZTE we could map water contents down to 0.1 cm3/cm3. Finally, we employed ZTE to monitor the development of film flow in a natural soil core with high temporal resolution. This opens the route for further quantitative imaging of soil water processes.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Haber-Pohlmeier, Sabina ;  Institute for Modelling Hydraulic and Environmental Systems, University of Stuttgart, Pfaffenwaldring 61, D-70569 Stuttgart, Germany
Caterina, David  ;  Université de Liège - ULiège > Urban and Environmental Engineering  ; Institute for Bio- and Geosciences Agrosphere (IBG-3), Research Center Jülich, D-52425 Jülich, Germany
Blümich, Bernhard ;  Institute for Technical and Macromolecular Chemistry, RWTH Aachen University, Worringer Weg 2, D-52074 Aachen, Germany
Pohlmeier, Andreas ;  Institute for Bio- and Geosciences Agrosphere (IBG-3), Research Center Jülich, D-52425 Jülich, Germany
Language :
English
Title :
Magnetic Resonance Imaging of Water Content and Flow Processes in Natural Soils by Pulse Sequences with Ultrashort Detection.
Publication date :
24 August 2021
Journal title :
Molecules
eISSN :
1420-3049
Publisher :
MDPI AG, Switzerland
Volume :
26
Issue :
17
Pages :
5130
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
DFG - Deutsche Forschungsgemeinschaft
Funding text :
Funding: This research was funded by The German Research Fund, DFG within the frame of the Transregional Collaborative Research Center DFG TR32, partial project T1.
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since 19 August 2024

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