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Abstract #0220

Integrated AC/DC coil and dipole Tx array for 7T MRI of the spinal cord

Nibardo Lopez Rios1, Ryan Topfer2, Alexandru Foias2, Axel Guittonneau2,3, Kyle M. Gilbert4, Ravi S. Menon4,5, Lawrence L. Wald6,7,8, Jason P. Stockmann6,7, and Julien Cohen-Adad2,9

1NeuroPoly Lab, Institute of Biomedical Engineering, Polytechnique Montreal, Montreal, QC, Canada, 2Electrical Engineering, Ecole Polytechnique de Montreal, Montreal, QC, Canada, 3École Normale Supérieure de Lyon, Lyon, France, 4Centre for Functional and Metabolic Mapping, The University of Western Ontario, London, ON, Canada, 5Department of Medical Biophysics, The University of Western Ontario, London, ON, Canada, 6Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 7Harvard Medical School, Boston, MA, United States, 8Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, United States, 9Functional Neuroimaging Unit, CRIUGM, University of Montreal, Montreal, QC, Canada

Imaging the spinal cord is a never-ending challenge, especially when venturing to ultra-high fields. We propose a novel coil design for spinal cord 7T MRI, which combines state-of-the-art transmit and receive technologies. The transmit coil is a 3-dipole array, allowing homogeneous B1 field with parallel excitation. The receive part consists of a 15-channel AC/DC coil that can achieve both high sensitivity and local B0 shimming, including real-time shimming to compensate for respiratory-induced field variations. The design can achieve 32% reduction of static field inhomogeneities and 27% reduction in temporal field variance, opening the door to exciting EPI and spectroscopy applications.

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