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Citation link: https://doi.org/10.26092/elib/2499

Publisher DOI: https://doi.org/10.1016/j.jmr.2017.01.017
L. Huang, G. Mikolajczyk, E. Kuestermann, M. Wilhelm, St. Odenbach, W. Dreher, Adapted MR velocimetry of slow liquid flow in porous media_2017_accepted_Deckblatt_pdfa1.pdf
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Adapted MR velocimetry of slow liquid flow in porous media


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L. Huang, G. Mikolajczyk, E. Kuestermann, M. Wilhelm, St. Odenbach, W. Dreher, Adapted MR velocimetry of slow liquid flow in porous media_2017_accepted_Deckblatt_pdfa1.pdf6.62 MBAdobe PDFView/Open
Authors: Huang, Li  
Mikolajczyk, Gerd 
Küstermann, Ekkehard 
Wilhelm, Michaela  
Odenbach, Stefan 
Dreher, Wolfgang  
Abstract: 
MR velocimetry of liquid flow in opaque porous filters may play an important role in better understanding the mechanisms of deep bed filtration. With this knowledge, the efficiency of separating the suspended solid particles from the vertically flowing liquid can be improved, and thus a wide range of industrial applications such as wastewater treatment and desalination can be optimized. However, MR velocimetry is challenging for such studies due to the low velocities, the severe B0 inhomogeneity in porous structures, and the demand for high spatial resolution and an appropriate total measurement time during which the particle deposition will change velocities only marginally. In this work, a modified RARE-based MR velocimetry method is proposed to address these issues for velocity mapping on a deep bed filtration cell. A dedicated RF coil with a high filling factor is constructed considering the limited space available for the vertical cell in a horizontal MR magnet. Several means are applied to optimize the phase contrast RARE MRI pulse sequence for accurately measuring the phase contrast in a long echo train, even in the case of a low B1 homogeneity. Two means are of particular importance. One uses data acquired with zero flow to correct the phase contrast offsets from gradient imperfections, and the other combines the phase contrast from signals of both odd and even echoes. Results obtained on a 7T preclinical MR scanner indicate that the low velocities in the heterogeneous system can be correctly quantified with high spatial resolution and an adequate total measurement time, enabling future studies on flow during the filtration process.
Keywords: MR pulse sequence; MR velocimetry; Phase contrast MRI; Porous media; Quantitative MRI; RARE; RF coil; Mimenima
Issue Date: 4-Feb-2017
Publisher: Elsevier
Project: MIMENIMA GRK 1860 
Funders: Deutsche Forschungsgemeinschaft
Grant number: 601090
Journal/Edited collection: Journal of magnetic resonance 
Start page: 103
End page: 112
Volume: 276
Type: Artikel/Aufsatz
ISSN: 1090-7807
Secondary publication: yes
Document version: Postprint
DOI: 10.26092/elib/2499
URN: urn:nbn:de:gbv:46-elib71793
Institution: Universität Bremen 
Faculty: Fachbereich 02: Biologie/Chemie (FB 02) 
Fachbereich 04: Produktionstechnik, Maschinenbau & Verfahrenstechnik (FB 04) 
Appears in Collections:Forschungsdokumente

  

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