مورد إلكتروني
Assessment of Reynolds stress components and turbulent pressure loss using 4D flow MRI with extended motion encoding.
| العنوان: | Assessment of Reynolds stress components and turbulent pressure loss using 4D flow MRI with extended motion encoding. |
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| المؤلفون: | Haraldsson, Henrik |
| المصدر: | Magnetic resonance in medicine; vol 79, iss 4, 1962-1971; 0740-3194 |
| بيانات النشر: | eScholarship, University of California 2018-04-01 |
| تفاصيل مُضافة: | Haraldsson, Henrik Kefayati, Sarah Ahn, Sinyeob Dyverfeldt, Petter Lantz, Jonas Karlsson, Matts Laub, Gerhard Ebbers, Tino Saloner, David |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | 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 equation-both 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; P < 0.001) and experimental (eg, 306 ± 11 vs 203 ± 6 Pa; P < 0.001) data. A 54% greater pressure loss is seen at the highest experimental flow rate when accounting for Reynolds stress (P < 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. © 2017 International Society for Magnetic Resonance in Medicine. |
| مصطلحات الفهرس: | Humans, Constriction, Pathologic, Imaging, Three-Dimensional, Magnetic Resonance Imaging, Blood Flow Velocity, Poisson Distribution, Reproducibility of Results, Phantoms, Algorithms, Stress, Mechanical, Motion, Pressure, Models, Cardiovascular, Computer Simulation, Hydrodynamics, MR flow imaging, arterial stenosis, hemodynamics, phase contrast MRI, pressure loss, turbulence, Biomedical Imaging, Clinical Research, Biomedical Engineering, Nuclear Medicine & Medical Imaging, article |
| URL: | |
| الإتاحة: | Open access content. Open access content public |
| ملاحظة: | application/pdf Magnetic resonance in medicine vol 79, iss 4, 1962-1971 0740-3194 |
| أرقام أخرى: | CDLER oai:escholarship.org:ark:/13030/qt036214nz qt036214nz https://escholarship.org/uc/item/036214nzTest https://escholarship.orgTest/ 1391595249 |
| المصدر المساهم: | UC MASS DIGITIZATION From OAIster®, provided by the OCLC Cooperative. |
| رقم الانضمام: | edsoai.on1391595249 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |