Abstract #0941

Trajectory correction for a 3D-Ultrashort Echo Time (UTE) sequence using the gradient system transfer function

Manuel Stich^1,2, Lenon Mendes Pereira ¹, Tobias Wech¹, Andreas Max Weng¹, Ralf Ringler², Thorsten A. Bley¹, and Herbert Köstler¹

¹Department of Diagnostic and Interventional Radiology, University Hospital of Würzburg, Würzburg, Germany, ²X-Ray and Molecular Imaging Laboratory, Ostbayerische Technische Hochschule Amberg-Weiden, Weiden, Germany

3D-Ultrashort Echo Time (UTE) sequences with 3D-kossh ball trajectory suffer from k-space trajectory deviations and ghosting artifacts due to hardware imperfections. The gradient system transfer function (GSTF), completely characterizes the gradient system as a linear and time-invariant (LTI) system. In this study, the GSTF was measured only using standard scanner hardware and was used to correct deviated trajectories in image reconstruction. This results in diminished ghosting artifacts and improve image quality.

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