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Abstract #0925

Real-time shimming in the cervical spinal cord using an 8-channel AC/DC array and a capacitive respiratory sensor

Ryan Topfer1, Nibardo Lopez Rios1, Alexandru Foias1, Nicolas Arango2, Lawrence L. Wald3,4,5, Jason P. Stockmann3,4, and Julien Cohen-Adad1,6

1NeuroPoly Lab, Institute of Biomedical Engineering, Polytechnique Montréal, Montreal, QC, Canada, 2Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 3Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 4Harvard Medical School, Boston, MA, United States, 5Harvard-MIT Division of Health Sciences and Technology, Cambridge, MA, United States, 6Functional Neuroimaging Unit, CRIUGM, University of Montreal, Montreal, QC, Canada

Spinal cord imaging remains challenging in large part due to the temporal variations in B0 caused by respiration. This study introduces a simple circuit design for a capacitive respiratory sensor and demonstrates the utility of this device in the context of real-time shimming the neck using an 8-channel "AC/DC" (integrated RF receive + multi-coil shim) array. Using this approach, motion artifacts in a multi-echo T2*-weighted acquisition are shown to be considerably reduced.

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