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Simultaneous multi-band multi-spectral imaging using multi-band RF excitation for accelerated metal artifact

Penghui Luo1, Jiantai Zhou1, Lin Chen2

  • 1Medical Imaging Center, Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China.

Medical Physics
|May 26, 2026
PubMed
Summary

This study introduces simultaneous multi-band multi-spectral imaging (SMB-MSI) to significantly reduce metal artifacts during MRI-guided interventions. The new technique improves needle visualization and shortens procedure times, enhancing safety and accuracy.

Keywords:
accelerated imagingmetal artifact reductionmulti‐band radiofrequency pulsesmulti‐spectral imaging

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Area of Science:

  • Medical Imaging
  • Interventional Radiology
  • Biomedical Engineering

Background:

  • Magnetic resonance imaging (MRI) offers excellent soft tissue contrast for guiding interventions.
  • Metallic needles cause artifacts that hinder visualization and increase risks during MRI-guided procedures.

Purpose of the Study:

  • To decrease metal-induced artifacts and shorten scan times in MRI-guided interventions.
  • To enhance imaging precision for needle guidance during procedures.

Main Methods:

  • A novel simultaneous multi-band multi-spectral imaging (SMB-MSI) sequence was developed using multi-band radiofrequency pulses.
  • The SMB-MSI sequence was evaluated against conventional MRI techniques using phantom and ex vivo porcine liver models at 0.35 T and 1.5 T.
  • Artifact width (FWHM) and signal-to-noise ratio (SNR) were quantified to assess performance.

Main Results:

  • SMB-MSI significantly reduced artifact width compared to conventional multi-spectral imaging (MSI).
  • Acquisition time was reduced by approximately 80% with SMB-MSI.
  • Higher SNR and clear visualization of needle tips with minimal distortion were achieved.

Conclusions:

  • SMB-MSI enables rapid and accurate MRI-guided needle visualization.
  • The technique substantially reduces metal-induced artifacts, improving procedural efficiency and precision.