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Localizing implanted fiducial markers using undersampled co-RASOR MR imaging.

Evan McNabb1, Raimond Wong2, Michael D Noseworthy3

  • 1McMaster School of Biomedical Engineering, McMaster University, Hamilton, Canada.

Magnetic Resonance Imaging
|December 13, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a faster method for localizing fiducial markers using undersampled radial imaging and advanced reconstruction techniques like Total Generalized Variation (TGV). Acquisition times were significantly reduced, improving imaging efficiency.

Keywords:
Accelerated radial imagingFiducial localizationPositive contrastTotal generalized variationco-RASOR

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Image Reconstruction

Background:

  • Accurate localization of fiducial markers is crucial for image-guided interventions.
  • Traditional MRI acquisition times can be lengthy, limiting clinical applicability.
  • Undersampling techniques offer potential for accelerated MRI but often introduce artifacts.

Purpose of the Study:

  • To develop and evaluate an accelerated MRI technique for fiducial marker localization.
  • To investigate the efficacy of iterative reconstruction methods in mitigating undersampling artifacts.
  • To reduce overall acquisition time for fiducial marker imaging.

Main Methods:

  • Utilized a dual-plane, center-out radial sampling sequence with off-resonance reception.
  • Employed conjugate gradient CG-SENSE and Total Generalized Variation (TGV) for image reconstruction.
  • Simulated field perturbers and imaged platinum fiducial markers in a phantom at sub-millimeter resolution.

Main Results:

  • Achieved single-slice acquisition times as low as 2.8 seconds.
  • Reduced total acquisition time to 73 seconds for multi-slice fiducial marker localization (R=8 undersampling).
  • Both TGV and CG-SENSE reconstructions significantly reduced noise in undersampled images, with TGV offering superior spatial resolution.

Conclusions:

  • Undersampled radial MRI with iterative reconstruction enables rapid fiducial marker localization.
  • TGV reconstruction provides a robust solution for artifact reduction and enhanced spatial resolution in accelerated MRI.
  • This technique holds promise for improving efficiency in image-guided procedures.