Jiacheng Zhang
-1
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04 Jan

Posted at 16:30h in Biomedical and Biological Flows, Computation Fluid Dynamics, Fluid Dynamics, Measurement and Data Science by
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This study introduces a novel wall shear stress (WSS) estimation method for 4D flow MRI. The method improves the WSS accuracy by using the reconstructed pressure gradient and the flow-physics constraints to correct velocity gradient estimation. The method was tested on synthetic 4D flow data...

04 Jan

Posted at 15:24h in Fluid Dynamics, Measurement and Data Science by
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This work introduces a method to estimate the uncertainty of the pressure fields reconstructed from particle image velocimetry / particle tracking velocimetry (PIV/PTV) measurements by propagating the instantaneous velocity vector uncertainty through the pressure reconstruction. The uncertainty propagations through the calculation and integration of pressure...

27 Jan

Posted at 16:41h in Biomedical and Biological Flows, Fluid Dynamics, Measurement and Data Science by
3 Likes

4D flow magnetic resonance imaging (MRI) allows for the in vivo acquisition of time-resolved three-dimensional (3D) blood flow, enabling the evaluation of hemodynamic quantities for cerebral aneurysms (CAs). However, the accuracy of flow-derived hemodynamic quantities such as pressure and wall shear stress (WSS) is affected...

14 Sep

Posted at 15:57h in Biomedical and Biological Flows, Fluid Dynamics, Measurement and Data Science by
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4D flow magnetic resonance imaging (MRI) allows for in vivo acquisition of time-resolved three-dimensional (3D) blood flow, thus enabling quantitative analysis of volumetric, time-varying hemodynamic quantities such as flow rates, wall shear stress (WSS), pressure difference, etc. 4D flow MRI is based on the phase...

30 Apr

Posted at 02:33h in Biomedical and Biological Flows, Fluid Dynamics, Measurement and Data Science by
1 Like

Pressure measured from the cardiovascular system is widely used to diagnose disease. Pressure reconstruction methods are increasingly of interest with the development of 4D flow magnetic resonance imaging (MRI) which noninvasively measures time-resolved velocity fields in-vivo. However, several error sources and limitations inherent to in...