Magnetic resonance in medicine · 2026
Design of an 8-Channel Transmit 32-Channel Receive 11.7T Head Coil and Evaluation of SNR Gains.
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Chu Son, Issac Jeslin Parackal, Le Ster Caroline, Amadon Alexis, Gras Vincent, Gapais Paul-François, Stirnberg Rüdiger, Boulant Nicolas, Gunamony Shajan
Аннотация
PURPOSE: To design and develop an 8-channel transmit 32-channel receive 11.7T head coil for the strongest human MRI scanner to date, demonstrate safety, and evaluate signal-to-noise ratio (SNR) gains compared to 7T, the most used ultra-high-field (UHF) platform.
METHODS: The transmit array design incorporated a folded-end radiofrequency (RF) shield to mitigate wave propagation in the scanner bore. The receive array consisted of 32-overlapped loops constructed on a helmet size-matched with the industry standard 7T head coil. The transmit array was characterized using B1 + mapping and MR thermometry, whereas the receive array performance was evaluated by measuring SNR at 7T and 11.7T using a lightbulb-shaped phantom filled with a tissue equivalent solution.
RESULTS: Loss due to wave propagation was 4.5% of the input power for the chosen RF shield. The mean magnitude of the complex correlations between the simulated and measured single channel B1 + maps was 94%, which highlights minimal interaction between the transmit and receive arrays. An SNR gain of three-fold was achieved in the phantom centre. In the periphery, representing the cortex, the SNR gain was 2.65-fold, and the average gain over the whole volume was a factor of 2.69. The g-factors of the 11.7T array were lower than the reference 7T coil due to the distinct coil sensitivities at higher frequency.
CONCLUSION: We report substantial SNR gains over the whole volume at 11.7T using a fully overlapped 32-channel loop array. The central SNR gain of B0 2.14 agrees with the theoretical prediction, while we also gain supra-linearly in the periphery.
METHODS: The transmit array design incorporated a folded-end radiofrequency (RF) shield to mitigate wave propagation in the scanner bore. The receive array consisted of 32-overlapped loops constructed on a helmet size-matched with the industry standard 7T head coil. The transmit array was characterized using B1 + mapping and MR thermometry, whereas the receive array performance was evaluated by measuring SNR at 7T and 11.7T using a lightbulb-shaped phantom filled with a tissue equivalent solution.
RESULTS: Loss due to wave propagation was 4.5% of the input power for the chosen RF shield. The mean magnitude of the complex correlations between the simulated and measured single channel B1 + maps was 94%, which highlights minimal interaction between the transmit and receive arrays. An SNR gain of three-fold was achieved in the phantom centre. In the periphery, representing the cortex, the SNR gain was 2.65-fold, and the average gain over the whole volume was a factor of 2.69. The g-factors of the 11.7T array were lower than the reference 7T coil due to the distinct coil sensitivities at higher frequency.
CONCLUSION: We report substantial SNR gains over the whole volume at 11.7T using a fully overlapped 32-channel loop array. The central SNR gain of B0 2.14 agrees with the theoretical prediction, while we also gain supra-linearly in the periphery.