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Abstract #2447

Single-shot spiral imaging using the gradient impulse response for trajectory prediction

Signe Johanna Vannesjo 1 , Nadine N Graedel 2 , Lars Kasper 1 , Simon Gross 1 , Christoph Barmet 1,3 , and Klaas P Pruessmann 1

1 Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland, 2 FMRIB Centre, University of Oxford, Oxford, United Kingdom, 3 Skope Magnetic Resonance Technologies, Zurich, Switzerland

Spiral imaging theoretically yields more time-efficient k-space coverage and increased robustness against flow and motion compared to Cartesian acquisitions. In practice however, the use of spiral acquisitions has been hampered by gradient system limitations causing deviations to the sampling trajectories. It has recently been proposed to perform image reconstruction based on trajectories predicted by a linear time-invariant model of the gradient system. Here, the method is shown to yield high-quality reconstructions of single-shot spiral images. We furthermore show high reproducibility of the gradient system characterization over years. The method holds promise to yield spiral imaging feasible on standard MR systems.

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