4D phase contrast (PC)-MRI is a non-invasive tool for the assessment of cardiovascular hemodynamics or the Wall Shear Stress (WSS) to study atherosclerotic risks in vivo. Major limitations of conventional triggered methods are the long measurement times needed for high-resolution data sets and the requirement of stable ECG triggering, which is diffcult at high magnetic field strengths. In this work, an ECG-free, retrospectively synchronized method is presented that enables fast high-resolution measurements of 4D flow and wall shear stress in the murine aortic arch.
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