Magnetic resonance in medicine · 2026
10.5 T In Vivo Head Imaging With Universal RF Shimming.
СтатьяНазвание и аннотация: Перевод в очереди
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Park Young Woo, Schmidt Simon, Bogner Wolfgang, Metzger Gregory J, Marjańska Małgorzata
Аннотация
PURPOSE: Brain MR imaging at 10.5 T ultra-high field offers significant improvements in signal-to-noise ratio (SNR), but faces challenges with B1 + inhomogeneity. Parallel-transmission (pTx) can be used to achieve a more uniform RF field distribution, but necessitates the use of B1 + calibration in the region of interest. This study explores a universal B1 + shim solution on 10.5 T that could eliminate the need for time-consuming subject-specific B1 + calibration.
METHODS: B1 + data from 7 participants (19 sessions) were used to develop the universal B1 + shim, which was then validated against traditional subject-specific approaches using T1-weighted MP2RAGE structural images in 5 participants (6 sessions). Statistical comparisons of tissue and subcortical segmentations were conducted using popular neuroimaging tools SPM and FreeSurfer, respectively.
RESULTS: The universal shim rapidly converged with a small training dataset, likely due to consistent positioning and the simplicity of B1 + shimming used for head imaging. Whole-brain tissue segmentation showed no statistically significant differences between universal and subject-specific solutions, with only minor variations near the ventricles and inferior brain regions in the detailed subcortical segmentation. The proposed universal B1 + shim reduces examination time by removing the need for separate data acquisition and optimization.
CONCLUSION: These findings suggest that the universal B1 + shim is a viable substitute for subject-specific approaches, offering a more efficient solution for neuroimaging applications. Additionally, it confirms that 10.5 T MRI can produce reliable structural brain imaging data, paving the way for broader adoption of ultra-high field MRI in neuroimaging research.
METHODS: B1 + data from 7 participants (19 sessions) were used to develop the universal B1 + shim, which was then validated against traditional subject-specific approaches using T1-weighted MP2RAGE structural images in 5 participants (6 sessions). Statistical comparisons of tissue and subcortical segmentations were conducted using popular neuroimaging tools SPM and FreeSurfer, respectively.
RESULTS: The universal shim rapidly converged with a small training dataset, likely due to consistent positioning and the simplicity of B1 + shimming used for head imaging. Whole-brain tissue segmentation showed no statistically significant differences between universal and subject-specific solutions, with only minor variations near the ventricles and inferior brain regions in the detailed subcortical segmentation. The proposed universal B1 + shim reduces examination time by removing the need for separate data acquisition and optimization.
CONCLUSION: These findings suggest that the universal B1 + shim is a viable substitute for subject-specific approaches, offering a more efficient solution for neuroimaging applications. Additionally, it confirms that 10.5 T MRI can produce reliable structural brain imaging data, paving the way for broader adoption of ultra-high field MRI in neuroimaging research.