Journal Article

PreJuSER-17433

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png NMR velocimetry with 13-interval stimulated echo multi-slice imaging in natural porous media under low flow rates

Spindler, N.FZJ* ; Galvosas, P. ; Pohlmeier, A.FZJ* ; Vereecken, H.FZJ*

2011
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.jmr.2011.07.004

Abstract: Characterization and quantification of root water uptake processes play a key role in understanding and managing the effects of global climate change on agricultural production and ecosystem dynamics. Part of this understanding is related to the flow of water towards plant roots in soils. In this study we demonstrate for the first time, to our knowledge, that fluid flow in the voids of the pore space of a model soil system (natural sand) can be detected and mapped to an NMR image for mean flows as low as 0.06 mm/s even under the influence of internal magnetic field gradients. To accomplish this we combined multi-slice imaging with a 13-interval pulse sequence to the NMR pulse sequence 13-interval stimulated echo multi-slice imaging (13-interval STEMSI). The result is a largely reduced influence of the internal magnetic field gradients, leading to an improved signal-to-noise ratio which in turn enables one to acquire velocity maps where conventional stimulated echo methods fail.

Keyword(s): Algorithms (MeSH) ; Artifacts (MeSH) ; Calibration (MeSH) ; Computer Simulation (MeSH) ; Electromagnetic Fields (MeSH) ; Image Processing, Computer-Assisted (MeSH) ; Magnetic Resonance Imaging: methods (MeSH) ; Normal Distribution (MeSH) ; Plant Roots: metabolism (MeSH) ; Porosity (MeSH) ; Signal-To-Noise Ratio (MeSH) ; Silicon Dioxide (MeSH) ; Soil: analysis (MeSH) ; Water: metabolism (MeSH) ; Soil ; Silicon Dioxide ; Water ; J ; NMR flow mapping (auto) ; Natural porous media (auto) ; Internal magnetic field gradients (auto)

Note: We gratefully acknowledge financial support by German Academic Exchange Service (DAAD), the Virtual Institute of Portable NMR funded by the Helmholtz Association (HGF) as well as the New Zealand Foundation for Research Science and Technology.

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. Terrestrische Umwelt (P24)

Appears in the scientific report 2011

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