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Abstract #0129

Iterative Trajectory Correction for Radial Projection Imaging

Tobias Wech1, Johannes Tran-Gia1, Dietbert Hahn1, Herbert Kstler1

1Institute of Radiology, University of Wrzburg, Wrzburg, Germany

Eddy currents as well as gradient delays lead to deviations in measured trajectories. Especially in non-Cartesian imaging, these errors can cause severe image artifacts. In this work, we propose a method which allows for a correction of trajectory errors for radial projection imaging with no need of any separately acquired calibration data. The method iteratively translates the measured projections using the GRAPPA operator in order to maximize the self-consistency of data in oversampled k-space regions. This results in shifted coordinates representing the truly measured trajectory.