Abstract #2978

Estimation of aortic valve effective orifice area: a same day comparison between Doppler echocardiography and 4D flow MRI

Hyungkyu Huh¹, Menhel Kinno², James D Thomas², Michael Markl^1,3, and Alex J Barker¹

¹Department of Radiology, Northwestern University, Chicago, IL, United States, ²Department of Cardiology, Feinberg Medical School, Chicago, IL, United States, ³Department of Biomedical Engineering, Northwestern University, Chicago, IL, United States

The purpose of this study was to compare the aortic valve effective orifice area (EOA) estimated between Doppler echocardiography and 4D flow MRI using a consecutive same-day study design to minimize inter-modality variability. Peak velocity and left ventricular outflow tract area were higher for MRI but velocity time integral was higher for echo. These differences were compensatory when computing EOA, which resulted in good agreement despite discrepancies in echo vs MRI. Volumetric 3D velocity information has the potential to better estimate EOA in the presence of eccentric jets. This potential strength will be studied in aortic stenosis patients.

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