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. Wald^3,4,5, Jason P. Stockmann^3,4, and Julien Cohen-Adad^1,6

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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