Magnetic resonance imaging of the mitral valve is challenging since the valve moves in and out of the image plane during the cardiac cycle. To more accurately measure mitral flow, a phase contrast sequence that uses offline feature-tracking of the valve in the long-axis view is proposed. The tracking result is exported to the scanner, allowing the slice position to change in real-time based on the cardiac phase.
The slice-following sequence outperformed the conventional sequence when quantifying regurgitant volumes. Hence, the new sequence is a promising method for improving the accuracy of trans-valvular flow.