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Assessment of Reynolds stress components and turbulent pressure loss using 4D flow MRI with extended motion encoding
Univ Calif San Francisco, CA 94143 USA.
Univ Calif San Francisco, CA 94143 USA.
Siemens Healthcare, Germany.
Linköping University, Department of Medical and Health Sciences, Division of Cardiovascular Medicine. Linköping University, Faculty of Medicine and Health Sciences. Region Östergötland, Heart and Medicine Center, Department of Clinical Physiology in Linköping. Linköping University, Center for Medical Image Science and Visualization (CMIV).
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2018 (English)In: Magnetic Resonance in Medicine, ISSN 0740-3194, E-ISSN 1522-2594, Vol. 79, no 4, p. 1962-1971Article in journal (Refereed) Published
Abstract [en]

PurposeTo measure the Reynolds stress tensor using 4D flow MRI, and to evaluate its contribution to computed pressure maps. MethodsA method to assess both velocity and Reynolds stress using 4D flow MRI is presented and evaluated. The Reynolds stress is compared by cross-sectional integrals of the Reynolds stress invariants. Pressure maps are computed using the pressure Poisson equationboth including and neglecting the Reynolds stress. ResultGood agreement is seen for Reynolds stress between computational fluid dynamics, simulated MRI, and MRI experiment. The Reynolds stress can significantly influence the computed pressure loss for simulated (eg, -0.52% vs -15.34% error; Pamp;lt;0.001) and experimental (eg, 30611 vs 203 +/- 6 Pa; Pamp;lt;0.001) data. A 54% greater pressure loss is seen at the highest experimental flow rate when accounting for Reynolds stress (Pamp;lt;0.001). Conclusion4D flow MRI with extended motion-encoding enables quantification of both the velocity and the Reynolds stress tensor. The additional information provided by this method improves the assessment of pressure gradients across a stenosis in the presence of turbulence. Unlike conventional methods, which are only valid if the flow is laminar, the proposed method is valid for both laminar and disturbed flow, a common presentation in diseased vessels. Magn Reson Med 79:1962-1971, 2018. (c) 2017 International Society for Magnetic Resonance in Medicine.

Place, publisher, year, edition, pages
WILEY , 2018. Vol. 79, no 4, p. 1962-1971
Keywords [en]
turbulence; phase contrast MRI; hemodynamics; pressure loss; MR flow imaging; arterial stenosis
National Category
Medical Laboratory and Measurements Technologies
Identifiers
URN: urn:nbn:se:liu:diva-145737DOI: 10.1002/mrm.26853ISI: 000425026800013PubMedID: 28745409OAI: oai:DiVA.org:liu-145737DiVA, id: diva2:1193987
Note

Funding Agencies|European Union [310612]; National Institutes of Health [HL114118, NS059944]

Available from: 2018-03-28 Created: 2018-03-28 Last updated: 2018-09-07

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Dyverfeldt, PetterLantz, JonasKarlsson, MattsEbbers, Tino
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Division of Cardiovascular MedicineFaculty of Medicine and Health SciencesDepartment of Clinical Physiology in LinköpingCenter for Medical Image Science and Visualization (CMIV)Applied Thermodynamics and Fluid MechanicsFaculty of Science & Engineering
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