k-T Accelerated 4D Flow MRI in the Aorta: Effect on Scan Time, Flow Quantification and Analysis of Wall Shear Stress

Bernd A. Jung¹, Michael Markl², Pegah Entezaril², Riti J. Mahadevia², Susanne Schnell²

The purpose of this study was to evaluate the utility of k-t parallel imaging for the acceleration of aortic 4D-flow MRI by systematically investigating the impact of different acceleration factors R and coil elements on quantification of hemodynamics parameters such as blood flow and wall shear stress. K-t accelerated 4D-flow MRI was performed in 10 healthy volunteers with R=3, 5 and 8 using a 12-channel and a 32-channel receiver coil and compared to conventional parallel imaging (GRAPPA, R=2). Data analysis included 3D blood flow visualization and quantification of peak velocities, flow rates and wall shear stress in different aortic locations.