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Abstract #1172

Pre-Emphasis Compensation of Oscillatory Phase Offsets in Phase-Contrast Flow Measurements

SUMMA25Julia Busch1, Signe Johanna Vannesjoe1, Daniel Giese1, 2, Christoph Barmet1, Klaas Pruessmann1, Sebastian Kozerke1, 2

1Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland; 2Division of Imaging Sciences and Biomedical Engineering, Kings College London, London, United Kingdom

Phase-contrast magnetic resonance imaging provides high resolution information about blood flow, however its application in a clinical setting is still limited due to its sensitivity to phase errors. Phase oscillations caused by mechanical vibrations of the gradient coils account for various degrees of phase offsets depending on the echo time point. A generic system-specific pre-emphasis would offer the possibility to compensate for 0th and 1st order phase offsets without the disadvantage of causing additional scan time. Focusing on the mechanical vibrations of the z-gradient it is demonstrated that pre-emphasis can reduce phase errors well below 1% of the encoding velocity.