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Related Experiment Videos

Passive catheter tracking during interventional MRI using hyperpolarized 13C.

Peter Magnusson1, Edvin Johansson, Sven Månsson

  • 1Amersham Health R&D AB (part of GE Healthcare), Medeon, Malmö, Sweden.

Magnetic Resonance in Medicine
|May 31, 2007
PubMed
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This study introduces a new passive MRI technique using a catheter filled with a hyperpolarized carbon-13 contrast agent for preclinical interventional procedures. The method successfully visualized the entire catheter length in vivo, showing promise for real-time applications.

Area of Science:

  • Medical Imaging
  • Interventional Radiology
  • Magnetic Resonance Imaging (MRI)

Background:

  • Preclinical interventional procedures in MRI commonly use active or passive catheter-tracking methods.
  • Existing methods have limitations in real-time visualization and soft-tissue contrast.

Purpose of the Study:

  • To introduce and evaluate a novel passive nonproton MRI technique for catheter tracking.
  • To assess the feasibility of using a hyperpolarized (13)C contrast agent for entire-length catheter visualization in vivo.

Main Methods:

  • Development of a prototype three-lumen catheter containing a flowing hyperpolarized (13)C contrast agent.
  • In vivo imaging in a pig aorta using the (13)C catheter.
  • Catheter reconstruction via back-projection and image fusion with offline proton MRI road mapping.

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Main Results:

  • Successful entire-length (13)C catheter projection visualization in vivo.
  • Achieved a catheter signal-to-noise ratio (SNR) of approximately 80.
  • Demonstrated an in-plane resolution of 2 x 2 mm(2) with a dual projection frame rate of ~700 ms.
  • High catheter signal, entire length visualization, and excellent soft-tissue contrast were observed.

Conclusions:

  • The novel passive nonproton MRI technique using hyperpolarized (13)C is effective for preclinical catheter tracking.
  • The demonstrated capabilities warrant further development towards a real-time interventional MRI system.
  • This technique offers potential for improved visualization in interventional radiology procedures.