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Abstract #4423

Flow Velocity Measurement in the Carotid Bifurcation Using 4D Flow-Sensitive MRI and Doppler Ultrasound

Andreas Harloff1, Timo Zech1, Felix Wegent1, Simon Bauer1, Martin Schumacher1, Michael Markl1

1University Hospital Freiburg, Freiburg, Baden-Wrttemberg, Germany

Flow-sensitive 4D MRI was used to assess absolute blood flow velocities within the carotid bifurcation in healthy volunteers and patients with high-grade internal carotid artery (ICA) stenosis before and after carotid endarterectomy. MRI data were compared with Doppler ultrasound as the reference method. Reliability and reproducibility of MRI based measurements were tested. Velocity measurement was feasible at any desired site of the carotid bifurcation. Compared to Doppler ultrasound, however, MRI underestimated systolic blood flow velocity by approximately 30%.