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Abstract #3422

Preclinical spiral imaging with a high-performance gradient insert: a comparison of trajectory correction methods

Hannah Scholten1, Tobias Wech1, Sascha Köhler2, and Jürgen E. Schneider3
1Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany, 2Bruker BioSpin MRI GmbH, Ettlingen, Germany, 3Leeds Institute of Cardiovascular and Metabolic Medicine, University of Leeds, Leeds, United Kingdom

Synopsis

Keywords: Artifacts, System Imperfections: Measurement & Correction, GIRF, GSTF, LTIWe compared three different trajectory correction methods in spiral phantom images on a preclinical 7T scanner with a high-performance gradient insert. The first was an isotropic delay-correction, the second a gradient correction based on the gradient system transfer function (GSTF), and the third employed measured trajectories. In both an axial and a double-oblique slice, the measured trajectory resulted in the best image quality, while the delay-corrected images suffered from halo effects and signal bleeding. The GSTF-corrected images only had minor remaining artifacts, stemming from trajectory deviations due to non-linearities in the gradient chain.

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