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Related Experiment Video

Updated: Jan 22, 2026

Substernal Thyroid Biopsy Using Endobronchial Ultrasound-guided Transbronchial Needle Aspiration
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GantryMate: A Modular MR-Compatible Assistance System for MR-Guided Needle Interventions.

Andreas Reichert1, Michael Bock1, Michael Vogele2

  • 1Department of Radiology, Medical Physics, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany and.

Tomography (Ann Arbor, Mich.)
|June 28, 2019
PubMed
Summary
This summary is machine-generated.

Magnetic resonance-guided needle interventions are enabled by a novel patient-mounted system for precise instrument tracking. This system overcomes space limitations in high-field magnetic resonance imaging (MRI) systems, achieving high targeting accuracy.

Keywords:
MR-guided interventional proceduresMRI-compatible assistance systeminterventional magnetic resonance imagingpercutaneous procedures

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Area of Science:

  • Medical Imaging
  • Minimally Invasive Procedures
  • Biomedical Engineering

Background:

  • Performing percutaneous minimally invasive interventions within closed-bore high-field magnetic resonance (MR) systems is challenging due to restricted space.
  • Existing methods lack the precision and real-time feedback required for accurate needle placement in MR environments.

Purpose of the Study:

  • To develop and evaluate a novel system for magnetic resonance-guided needle interventions.
  • To enhance targeting accuracy and enable real-time instrument tracking within high-field MR systems.

Main Methods:

  • A patient-mounted assistance system with movable plates was developed to align an external passive marker with anatomical targets.
  • A real-time instrument tracking sequence utilizing a phase-only cross-correlation algorithm for marker detection was implemented.
  • Targeting accuracy was assessed using phantom experiments and validated in in vivo studies.

Main Results:

  • Phantom experiments demonstrated a targeting accuracy of 1.7 ± 1.0 mm for target depths up to 38 ± 13 mm.
  • The system successfully enabled real-time tracking of instruments.
  • In vivo experiments confirmed the ability to track and target both static and moving anatomical structures.

Conclusions:

  • The developed patient-mounted assistance system combined with real-time tracking significantly improves the feasibility and accuracy of MR-guided needle interventions.
  • This technology addresses the spatial limitations of high-field MR systems, paving the way for more precise minimally invasive procedures.
  • The system shows potential for various interventional applications within the MR environment.