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Related Experiment Videos

Active catheter tracking using parallel MRI and real-time image reconstruction.

Michael Bock1, Sven Müller, Sven Zuehlsdorff

  • 1Deutsches Krebsforschungszentrum, Heidelberg, Germany. m.bock@dkfz.de

Magnetic Resonance in Medicine
|May 10, 2006
PubMed
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This study introduces faster MRI catheter tracking using an optimized GRAPPA technique, reducing scan time by 34%. This enables real-time imaging for precise navigation within the heart.

Area of Science:

  • Medical Imaging
  • Cardiovascular Interventions
  • Magnetic Resonance Imaging

Background:

  • Real-time Magnetic Resonance Imaging (MRI) is crucial for guiding catheter-based interventions.
  • Traditional MRI acquisition times limit its use in dynamic procedures like cardiac catheterization.
  • Optimizing parallel imaging techniques can accelerate MRI acquisition and reconstruction.

Purpose of the Study:

  • To combine active MR catheter tracking with automatic slice alignment and an autocalibrated parallel imaging technique.
  • To accelerate real-time Generalized Autocalibrating Partially Parallel Acquisitions (GRAPPA) image reconstruction.
  • To evaluate the feasibility of this combined approach for cardiac catheter navigation.

Main Methods:

  • An optimized GRAPPA algorithm with an acceleration factor of 2 was employed.

Related Experiment Videos

  • Coil sensitivities were updated post-slice reorientation to accelerate real-time reconstruction.
  • A 2D trueFISP sequence was used with up to six imaging coils for real-time reconstruction.

    • Main Results:

    • Acquisition time per image was reduced by 34%.
    • Real-time image reconstruction was achieved with an image update rate of approximately five images per second.
    • Minor image artifacts were observed, and intracardiac structures were sharply delineated.

    Conclusions:

    • The combined active MR catheter tracking and accelerated GRAPPA technique significantly reduces acquisition time.
    • This method allows for real-time MRI guidance during cardiac catheter interventions.
    • The enhanced temporal resolution improves visualization of dynamic cardiac structures.