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10.5 T In Vivo Head Imaging With Universal RF Shimming.

Young Woo Park1,2,3, Simon Schmidt1,4, Wolfgang Bogner5,6,7

  • 1Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, Minnesota, USA.

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|January 20, 2026
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Summary
This summary is machine-generated.

A new universal B1+ shim for 10.5T MRI eliminates the need for subject-specific calibration, speeding up brain imaging. This efficient solution provides reliable structural brain data for neuroimaging research.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Neuroimaging
  • Radiofrequency (RF) Engineering

Background:

  • Ultra-high field (UHF) MRI at 10.5 Tesla (T) offers enhanced signal-to-noise ratio (SNR) for brain imaging.
  • RF field (B1+) inhomogeneity is a significant challenge at 10.5T, impacting image quality.
  • Parallel-transmission (pTx) can improve B1+ uniformity but requires time-consuming subject-specific calibration.

Purpose of the Study:

  • To develop and validate a universal B1+ shim solution for 10.5T brain MRI.
  • To eliminate the need for subject-specific B1+ calibration, thereby reducing scan time.
  • To assess the performance of the universal shim compared to traditional methods in structural brain imaging.

Main Methods:

  • Developed a universal B1+ shim using B1+ data from 7 participants (19 sessions).
  • Validated the universal shim against subject-specific approaches using T1-weighted MP2RAGE sequences in 5 participants (6 sessions).
  • Performed statistical comparisons of brain tissue and subcortical segmentations using SPM and FreeSurfer.

Main Results:

  • The universal shim converged rapidly with a small training dataset, indicating efficiency.
  • Whole-brain tissue segmentation showed no significant differences between universal and subject-specific shims.
  • Subtle variations were observed only in specific regions (ventricles, inferior brain), suggesting high overall comparability.
  • The universal shim significantly reduces examination time by removing the need for separate calibration scans.

Conclusions:

  • The universal B1+ shim is a viable and efficient alternative to subject-specific calibration for 10.5T neuroimaging.
  • This approach streamlines the acquisition of reliable structural brain imaging data at ultra-high field strengths.
  • The findings support the broader adoption of 10.5T MRI in neuroimaging research due to improved efficiency and data quality.