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)