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Related Experiment Videos

Device visualization for interventional MRI using local magnetic fields: basic theory and its application to catheter

A Glowinski1, J Kürsch, G Adam

  • 1Department of Radiology, Aachen University of Technology, Germany. glow@rad.rwth-aachen.de

IEEE Transactions on Medical Imaging
|January 5, 1999
PubMed
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This study introduces a novel method for visualizing interventional devices during magnetic resonance imaging (MRI) procedures. By using a copper loop to induce local magnetic fields, catheter visualization is improved, aiding in MRI-guided interventions.

Area of Science:

  • Medical Imaging
  • Biophysics

Background:

  • Interventional magnetic resonance imaging (MRI) faces challenges in visualizing medical devices.
  • Locally induced magnetic fields from devices disrupt MRI's main magnetic field homogeneity.
  • This disruption causes signal loss and phase image disturbances, hindering device tracking.

Purpose of the Study:

  • To present a method for visualizing interventional devices, specifically catheters, during MRI procedures.
  • To theoretically and computationally analyze the impact of induced magnetic fields on MRI signal and phase.
  • To validate the proposed visualization technique using simulated and experimental data.

Main Methods:

  • A method using a closed copper loop with low current to induce local magnetic fields along the device.
  • Simulations to assess intravoxel dephasing effects, excluding susceptibility and RF artifacts.

Related Experiment Videos

  • Verification of theoretical models with scanned and simulated MRI data.
  • Discussion of various wire loop configurations and proposal of two catheter visualization scan types.

    • Main Results:

    • Simulations quantified intravoxel dephasing effects caused by the induced fields.
    • Scanned and simulated data confirmed the theoretical predictions regarding signal and phase disturbances.
    • Evaluation of different wire loop designs for optimal catheter visualization.
    • Successful demonstration of the technique in a pig study for intravascular interventions.

    Conclusions:

    • The proposed method effectively visualizes catheters during MRI-guided interventions.
    • This technique shows significant promise for improving the safety and efficacy of intravascular procedures under MRI guidance.
    • Further development could enhance real-time device tracking in interventional MRI.