Key result
Ultrasound vector flow imaging underestimated flow velocity magnitude compared to PIV and CFD in a left ventricular outflow tract phantom, while CFD results closely matched PIV measurements.
Why the study?
How do ultrasound vector flow imaging and CFD simulations compare to PIV measurements for flow quantification in a left ventricular outflow tract phantom?
How do ultrasound vector flow imaging and CFD simulations compare to PIV measurements for flow quantification in a left ventricular outflow tract phantom?
CFD simulations closely match PIV reference measurements for LVOT flow characteristics, whereas ultrasound vector flow imaging underestimates flow velocity magnitude.
Answers are grounded in this paper and cite their sources.
May caution against ultrasound VFI for LVOT flow quantification; leaves open in vivo validation of CFD and VFI.
In this study we have compared two modalities for flow quantification from measurement data; ultrasound (US) and shadow particle image velocimetry (PIV), and a flow simulation model using computational fluid dynamics (CFD). For the comparison we have used an idealized Quasi-2D phantom of the human left ventricular outflow tract (LVOT). The PIV data will serve as a reference for the true flow field in our setup. Furthermore, the US vector flow imaging (VFI) data has been post processed with model-based regularization developed to both smooth noise and sharpen physical flow features. The US VFI flow reconstruction results in an underestimation of the flow velocity magnitude compared to PIV and CFD. The CFD results coincide very well with the PIV flow field maximum velocities and curl intensity, as well as with the detailed vortex structure, however, this correspondence is subject to exact boundary conditions.
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Leinan et al. (2022) studied Left ventricular outflow tract flow (phantom model). Ultrasound vector flow imaging (VFI) and computational fluid dynamics (CFD) vs. Particle image velocimetry (PIV) was evaluated on Flow velocity magnitude and vortex structure. Ultrasound vector flow imaging underestimated flow velocity magnitude compared to PIV and CFD in a left ventricular outflow tract phantom, while CFD results closely matched PIV measurements.
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