Abstract #0741

Spiral Acquisition for High-Speed Anatomical Imaging at 7T

Lars Kasper^1,2, Christoph Barmet^1,3, Maria Engel¹, Maximilian Haeberlin¹, Bertram J Wilm¹, Benjamin E Dietrich¹, Thomas Schmid¹, David O Brunner¹, Klaas E Stephan^2,4,5, and Klaas P Pruessmann¹

¹Institute for Biomedical Engineering, University of Zurich and ETH Zurich, Zuerich, Switzerland, ²Translational Neuromodeling Unit, IBT, University of Zurich and ETH Zurich, Zuerich, Switzerland, ³Skope Magnetic Resonance Technologies, Zurich, Switzerland, ⁴Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom, ⁵Max Planck Institute for Metabolism Research, Cologne, Germany

We present whole-brain, high-resolution (0.5mm) spiral imaging with proton-density and T2* contrast at 7T in less than a minute. Owing to a comprehensive characterization of the imaging process, artifact-free image reconstruction from long-readout spiral shots (20 ms) becomes feasible via an iterative SENSE algorithm. In particular, trajectory imperfections as well as dynamic off-resonance changes are captured via concurrent field monitoring, while static off-resonance as well as coil sensitivities are mapped in a multi-echo reference scan and augment image reconstruction. The resulting images exhibit the same geometric fidelity as spin-warp images at a fraction of the total acquisition duration.

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