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Related Experiment Videos

Catheter visualization using locally induced, actively controlled field inhomogeneities

A Glowinski1, G Adam, A Bücker

  • 1Clinic for Diagnostic Radiology, University of Technology Aachen, Germany.

Magnetic Resonance in Medicine
|August 1, 1997
PubMed
Summary

This study introduces a novel magnetic resonance (MR) imaging technique for visualizing interventional devices. The method uses a current-carrying wire on a catheter to create localized magnetic field disturbances, enabling real-time device tracking during procedures.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Interventional Radiology

Background:

  • Accurate visualization of interventional devices during procedures is crucial for patient safety and efficacy.
  • Current magnetic resonance (MR) imaging techniques have limitations in real-time tracking of catheter-based devices.
  • The need for improved methods to guide minimally invasive interventions is ongoing.

Purpose of the Study:

  • To present a new technique for visualizing interventional devices using magnetic resonance (MR) imaging.
  • To demonstrate the feasibility of using a current-induced local magnetic field for catheter tracking.
  • To enable real-time, adjustable visualization of catheter position and features during MR-guided interventions.

Main Methods:

  • A prototype catheter was modified with a thin copper wire loop carrying a small current (10-150 mA).

Related Experiment Videos

  • This current generated a local magnetic field along the catheter, disturbing the main MR imager's magnetic field homogeneity.
  • Fast gradient echo sequences were employed for rapid imaging, utilizing signal loss in disturbed areas for visualization.

    • Main Results:

    • The technique successfully visualized the catheter by creating dark signal areas within the MR images corresponding to the local magnetic field disturbances.
    • The extent of the dark signal, and thus the visualization, could be adjusted by altering the current intensity.
    • Different wire configurations allowed for visualization of the entire catheter or specific parts, such as balloon markers.

    Conclusions:

    • The presented MR technique offers a novel and adjustable method for visualizing interventional catheters.
    • This approach has the potential to enhance the safety and precision of MR-guided interventional procedures.
    • Further development could integrate this technique into routine clinical practice for various catheter-based interventions.