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Abstract #1367

Inline Magnitude of Velocity Calculation for Phase Contrast MRA Improves Cardiac Valvular Assessment

Philip Anthony Hodnett1,2, Jeremy D. Collins3, Timothy Scanlon, Amir H. Davarpanah, Peter Weale4, Sven Zuehlsdorff4, James C. Carr, Chris Glielmi4

1Department of Cardiovascular Imaging, Northwestern University, Chicago, IL, United States; 2Northshore University HealthCare System, Chicago, IL, United States; 3Northwestern University, United States; 4Siemens Healthcare, MR Research and Development, Chicago, IL

Background: Standard phase contrast MRI (PC-MRI) has potential sources for error when used in assessment of cardiac valvular pathology. We propose a new directionally independent tool for peak velocity evaluation Methods:The technique employs a phase contrast sequence with three flow encoding directions and one flow compensated reference. Phase difference images between between each flow encoded and the flow compensated images were quantified for directional velocity Results: The root sum of square of the 3D encoded data is computed inline and displayed in a magnitude of velocity dataset for each patient. We compared standard Throughplane phase contrast MRA and Inline calculation velocity of magnitude to the reference standard echocardiography. Conclusion:Extracting the magnitude of peak velocity independent of its direction significantly reduces error in peak velocity estimation (one-tailed t-test:p<0.02)