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An eight‐channel Tx dipole and 20‐channel Rx loop coil array for MRI of the cervical spinal cord at 7 tesla

Nibardo Lopez Rios, Kyle M. Gilbert, Daniel S. Papp, Gaspard Cereza, Alexandru Foias, Deshpande Rangaprakash, Markus W. May, Bastien Guerin, Lawrence L. Wald, Boris Keil, Jason P. Stockmann, Robert Barry and Julien Cohen-Adad

Article (2023)

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Résumé

The quality of cervical spinal cord images can be improved by the use of tailored radiofrequency (RF) coil solutions for ultrahigh field imaging; however, very few commercial and research 7-T RF coils currently exist for the spinal cord, and in particular, those with parallel transmission (pTx) capabilities. This work presents the design, testing, and validation of a pTx/Rx coil for the human neck and cervical/upper thoracic spinal cord. The pTx portion is composed of eight dipoles to ensure high homogeneity over this large region of the spinal cord. The Rx portion is made up of twenty semiadaptable overlapping loops to produce high signal-to-noise ratio (SNR) across the patient population. The coil housing is designed to facilitate patient positioning and comfort, while also being tight fitting to ensure high sensitivity. We demonstrate RF shimming capabilities to optimize B1+ uniformity, power efficiency, and/or specific absorption rate efficiency. B1+ homogeneity, SNR, and g-factor were evaluated in adult volunteers and demonstrated excellent performance from the occipital lobe down to the T4-T5 level. We compared the proposed coil with two state-of-the-art head and head/neck coils, confirming its superiority in the cervical and upper thoracic regions of the spinal cord. This coil solution therefore provides a convincing platform for producing the high image quality necessary for clinical and research scanning of the upper spinal cord.

Uncontrolled Keywords

7 T, dipole, MRI, radiofrequency coil, spinal cord, transmit/receive coil, ultrahigh field

Subjects: 1900 Biomedical engineering > 1900 Biomedical engineering
Department: Institut de génie biomédical
Research Center: NeuroPoly - Laboratoire de Recherche en Neuroimagerie
Funders: Canada Foundation for Innovation, Canada First Research Excellence Fund, National Institutes of Health, Canadian Institutes of Health Research, Natural Sciences and Engineering Research Council of Canada, Fonds de Recherche du Québec - Santé, Canada Research Chair in Quantitative Magnetic Resonance Imaging, Quebec BioImaging Network, Mila - Tech Transfer Funding Program, Brain Canada, National Institute of Biomedical Imaging and Bioengineering, Center for Mesoscale Mapping, RLB
Grant number: 34824, 32454, S10OD023637, CIHRFDN‐143263, RGPIN‐2019‐07244, 322736, CRC-2020-00179, 5886, 35450, P41EB015896, P41EB030006, R01EB027779
PolyPublie URL: https://publications.polymtl.ca/54363/
Journal Title: NMR in Biomedicine (vol. 36, no. 11)
Publisher: Wiley
DOI: 10.1002/nbm.5002
Official URL: https://doi.org/10.1002/nbm.5002
Date Deposited: 15 Sep 2023 15:52
Last Modified: 28 Sep 2024 22:25
Cite in APA 7: Rios, N. L., Gilbert, K. M., Papp, D. S., Cereza, G., Foias, A., Rangaprakash, D., May, M. W., Guerin, B., Wald, L. L., Keil, B., Stockmann, J. P., Barry, R., & Cohen-Adad, J. (2023). An eight‐channel Tx dipole and 20‐channel Rx loop coil array for MRI of the cervical spinal cord at 7 tesla. NMR in Biomedicine, 36(11), e5002 (17 pages). https://doi.org/10.1002/nbm.5002

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