Transceiver 16-Channel Coaxial-End Dipole Array for Combined Head and C-Spine MRI at 9.4 T.

Overview

1. High‐Field MR Center Max Planck Institute for Biological Cybernetics Tübingen Germany
2. Institute of Biomedical Imaging Graz University of Technology Graz Austria
3. Erwin L. Hahn Institute for MRI University Duisburg‐Essen Essen Germany
4. High‐Field and Hybrid MR Imaging University Hospital Essen Essen Germany
5. Electronical Workshop Max Planck Institute for Biological Cybernetics Tübingen Germany
6. Department for Biomedical Magnetic Resonance University of Tübingen Tübingen Germany
7. Core Facility for Magnetic Resonance Imaging, Medical Faculty University of Tübingen Tübingen Germany

Abstract

This work aims to design a double‐row transceiver array consisting of 16 folded‐end coaxial‐end dipoles for combined C‐spine and brain imaging. The curved coaxial‐end dipole elements were aligned on a tight‐fitting, ergonomically shaped conformal holder optimized for subject comfort. Transmit efficiency, B1 + field homogeneity, and tissue‐specific absorption rate (SAR) were numerically evaluated using electromagnetic simulations and optimized with respect to several configurations of the array geometry. After identifying the optimal array configuration, the array was built and tested on a bench and in the MRI scanner, using anatomical imaging and transmit field mapping on a phantom and healthy volunteers. The designed array provided RF excitation over the entire brain and cervical spinal cord down to the C7 region, covering a field of view of more than 365 mm in head‐foot direction. Measured in a region covering the cerebrum, cerebellum, brainstem, and C‐spine, it achieved B1 + field homogeneity of ~31% (coefficient of variation), mean transmit efficiency of ~0.38 μT/√W, and SAR efficiency of 0.65 μT/√W/kg when driven in the circularly polarized mode. The acquired anatomical MR images confirmed that the constructed array provided coverage of the brain and C‐spine.

Reproduced under the paper's license (CC BY), from the paper cited above.

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Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Version 1, 30 September 2026: the first record

Recorded: type, language, journal, volume, issue, pages, dates, 12 authors, 11 MeSH terms, 3 funders, 84 references.

Cite

This paper

Solomakha, G. A., Glang, F., May, M. W., Mueller, S., Walzog, J., Aghaeifar, A., Bosch, D., Bause, J., Kraff, O., Scheffler, K., Quick, H. H., & Avdievich, N. I. (2026). Transceiver 16-Channel Coaxial-End Dipole Array for Combined Head and C-Spine MRI at 9.4 T. NMR in biomedicine, 39(3), e70228. https://doi.org/10.1002/nbm.70228

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