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Slice-by-slice B1+ shimming at 7 T.

Andrew T Curtis1, Kyle M Gilbert, L Martyn Klassen

  • 1Centre for Functional and Metabolic Mapping, Robarts Research Institute, Department of Medical Biophysics, The University of Western Ontario, London, Ontario, Canada.

Magnetic Resonance in Medicine
|January 4, 2012
PubMed
Summary

Slice-by-slice B1+ shimming in high-field MRI significantly improves radiofrequency field homogeneity and efficiency. This advanced technique optimizes transmit performance and reduces power deposition, enhancing imaging quality.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency (RF) Engineering
  • Medical Physics

Background:

  • High-field MRI (≥3 T) faces challenges with inhomogeneous radiofrequency (RF) fields.
  • Parallel transmission is used to mitigate these RF field inhomogeneities.
  • Further optimization is needed for improved transmit homogeneity and efficiency.

Purpose of the Study:

  • To investigate the benefits of multislice B1+ shimming for improving RF field homogeneity and efficiency in high-field MRI.
  • To compare slice-by-slice shimming with traditional volume coil modes.
  • To assess the impact on transmitted power and specific absorption rate (SAR).

Main Methods:

  • Utilized a 15-channel head-only transceive array at 7 T.
  • Implemented slice-by-slice B1+ shim solutions, optimizing for excitation efficiency and uniformity.
  • Acquired performance measures including B1+ field strength, standard deviation, and relative/global SAR.
  • Compared results against a circularly polarized volume mode.

Main Results:

  • Slice-by-slice shimming for efficiency improved mean B1+ by 12.8±2.4% and reduced B1+ standard deviation by 16.3±6.8%.
  • This method also reduced relative SAR by 6.2±3.1%.
  • Shimming for uniformity further enhanced B1+ mean and standard deviation by 15.9±2.6% and 26.2±10.4%, respectively, with increased global SAR.

Conclusions:

  • Robust multislice B1+ shim solutions can be rapidly calculated and applied in real-time.
  • This technique reliably outperforms traditional volume coil modes for transmit homogeneity and efficiency.
  • Slice-by-slice shimming offers a powerful approach to optimize RF field performance in high-field MRI.