Performance characterization of three coils for whole brain and/or cervical spinal cord MRI at 7T
D Rangaprakash1, Bastien Guerin1, Jason P Stockmann1, Markus W May2, Nibardo Lopez Rios3, Kyle M Gilbert4, Yulin Chang5, Lawrence L Wald1,6, Julien Cohen-Adad3,7,8, Boris Keil1,2, and Robert L Barry1,6
1Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States, 2Institute of Medical Physics and Radiation Protection, University of Applied Sciences Mittelhessen, Giessen, Germany, 3NeuroPoly Lab, Institute of Biomedical Engineering, Polytechnique Montreal, Montreal, QC, Canada, 4Centre for Functional and Metabolic Mapping, The University of Western Ontario, London, ON, Canada, 5Siemens Medical Solutions USA Inc., Malvern, PA, United States, 6Harvard-Massachusetts Institute of Technology Division of Health Sciences & Technology, Cambridge, MA, United States, 7Functional Neuroimaging Unit, CRIUGM, Université de Montréal, Montreal, QC, Canada, 8Mila – Quebec AI Institute, Montreal, QC, Canada
Several neurological diseases affect both the brain and spinal cord. 7T MRI enables better imaging of the narrow cord as well as single-subject prediction using fMRI. However, concurrent brain-cord 7T imaging requires a coil with good SNR and acceleration capabilities in both head and neck, which has been unavailable. To overcome this, we performed flip-angle, SNR, g-factor and tSNR characterization of a custom-built 16Tx/64Rx head/neck radiofrequency coil. We also compared it against a custom-built 8Tx/20Rx cervical spine coil as well as a commercial 8Tx/32Rx brain coil. This hardware will pave the way for concurrent brain-cord 7T MRI in the future.
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