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Abstract #0862

Analysis of abdominal movement with Phase Optical Flow: Application to Diffusion imaging.

Stephan Hahn1, Maxime Gérard1, Damien Dasnoy-Sumell1, Julie Absil2, Olivier Debeir1, and Thierry Metens2

1Laboratories of Image, Signal processing and Acoustics, ULB, Brussels, Belgium, 2MRI Clinics&Radiology, Hôpital Erasme, Brussels, Belgium

We present a new method, the Phase Optical Flow, which provides an automatic determination of abdominal regional movements along the cardiac cycle and allows a real time determination of the optimal cardiac trigger time to be used in quantitative liver DWI. A phase based motion amplification was applied to real-time BTFE images acquired at 20 images/s. Then optical flow was used to derive the velocity vector field. The optimal cardiac time window was defined as the 100ms-period with minimal absolute vertical velocity. Validation was provided by liver DWI obtained at several cardiac trigger times.

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