Magnus Ziegler1,2, Jonas Lantz1,2, Tino Ebbers1,2, and Petter Dyverfeldt1,2
1Division of Cardiovascular Medicine, Department of Medical and Health Sciences, Linköping University, Linköping, Sweden, 2Centre for Medical Image Science and Visualization (CMIV), Linköping University, Linköping, Sweden
Chaotic velocity fluctuations caused by turbulent blood flow create
fluctuations in the shear stress acting on the vascular wall. This turbulent
wall shear stress can cause vascular remodeling and increased endothelial cell
turnover. This work explores the use of MR-estimated turbulent kinetic energy
(TKE) for mapping the turbulent wall shear stress. Time-resolved velocity data
for non-pulsatile flow was obtained using computational fluid dynamics in two
patient-derived geometries and used to simulate PC-MRI measurements. Near-wall
TKE was estimated using a novel sampling method and was found to correlate
strongly to turbulent wall shear stress, opening new avenues for analysis.
