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Abstract #3785

Robust Estimation of True K-Space Center Position for Radial Center-Out Trajectories

Martin Krmer1, Karl-Heinz Herrmann1, Jrgen R. Reichenbach1

1Medical Physics Group, Institute of Diagnostic and Interventional Radiology I, Jena University Hospital - Friedrich Schiller University Jena, Jena, Germany

Radial center-out trajectories are extremely sensitive towards imperfections in the gradient and data sampling hardware. Even the smallest jitter between data sampling and gradient onset must be compensated during image reconstruction in order to obtain images free of delay artifacts. We propose to estimate such delays with a template scan using a very short additional dephaser. The delay is given from the difference between the expected k-space center position along the template readouts and the actual center crossing. We shot that a very robust estimation of the true k-space center crossing can be made by analyzing k-space phase directly.