Wall Shear Stress Vectors Derived from 3D Phase Contrast MRI at Increasing Resolutions in an Intracranial Aneurysm Phantom

Pim van Ooij¹, ², Wouter V. Potters¹, Charles B. Majoie¹, Ed vanBavel², Aart J. Nederveen¹

Due to limited resolution and SNR, estimating wall shear stress (WSS) from time-resolved 3D phase contrast MRI is challenging. In this study, a recently in-house developed WSS algorithm is tested on 3D PC-MRI data obtained in an intracranial aneurysm phantom, measured with steady flow at different resolutions. Flow patterns are similar, albeit with more detail at higher resolutions. The maximum and mean WSS increased with increasing resolution. Directions of WSS vectors and regions were similar. More WSS complexity could be observed at higher resolutions. For accurate WSS estimations, resolution must be as high as possible.