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- Title
Comparing velocity and fluid shear stress in a stenotic phantom with steady flow: phase-contrast MRI, particle image velocimetry and computational fluid dynamics.
- Authors
Khodarahmi, Iman
- Abstract
Object: This study aims to validate phase-contrast magnetic resonance imaging (PC-MRI) measurements of a steady flow through a severe stenotic phantom using particle image velocimetry (PIV) and computational fluid dynamics (CFD). Materials and methods: The study was performed in an axisymmetric 87 % area stenosis model using an inlet Reynolds number ( Re) of 160, corresponding to a jet Re of 444. Velocity patterns and estimated fluid shear stresses from three modalities were analyzed and compared qualitatively and quantitatively. Results: Visual analysis via contour subtraction and Bland-Altman plots showed good agreement for flow velocities and less agreement for maximum shear stress (MSS). The Pearson's coefficients of correlation between PC-MRI and PIV were 0.97 for the velocity field and 0.82 for the MSS. The corresponding parameters between PC-MRI and CFD were 0.96 and 0.84, respectively. Conclusion: Findings indicate that PC-MRI can be implemented to estimate velocity flow fields and MSS; however, this method is not sufficiently accurate to quantify the MSS at regions of high shear rate.
- Subjects
SHEARING force; STEADY-state flow; IMAGING phantoms; PHASE contrast magnetic resonance imaging; COMPUTATIONAL fluid dynamics
- Publication
MAGMA: Magnetic Resonance Materials in Physics, Biology & Medicine, 2015, Vol 28, Issue 4, p385
- ISSN
0968-5243
- Publication type
Article
- DOI
10.1007/s10334-014-0476-x