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Selective embolization with magnetized microbeads using magnetic resonance navigation in a controlled-flow liver

François Michaud1,2, Ning Li3, Rosalie Plantefève1,2

  • 1Université de Montréal, 2900 Boulevard Edouard-Montpetit, Montréal, Québec, H3T 1J4, Canada.

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This study demonstrates magnetic resonance navigation (MRN) feasibility for targeted tumor embolization. By controlling blood flow and steering magnetized particles, MRN offers a promising approach for selective embolization techniques.

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Area of Science:

  • Biomedical Engineering
  • Interventional Radiology
  • Medical Imaging

Background:

  • Magnetic Resonance Navigation (MRN) is an emerging technique for targeted therapies.
  • Controlling blood flow is crucial for effective navigation of therapeutic agents within the vasculature.
  • Selective tumor embolization aims to block blood supply to tumors, inhibiting their growth.

Purpose of the Study:

  • To demonstrate the feasibility of using a custom gradient sequence on an unmodified 3T MRI scanner for MRN.
  • To investigate blood flow control methods in vivo for MRN.
  • To reproduce rheology in a phantom and steer magnetized microbead aggregates for selective tumor embolization.

Main Methods:

  • Measured arterial hepatic velocity in pigs using cine phase-contrast imaging under free-flow and controlled-flow conditions.
  • Reproduced in vivo flow velocities in a vascular bifurcation phantom with injected saline.
  • Steered 200-μm magnetized particles towards specific arterial branches using MRN gradients.

Main Results:

  • Controlled blood flow reduced velocity and pulsatility, aiding steering.
  • MRN successfully steered aggregates to target arterial branches with 100% accuracy at specific orientations (P < 0.001).
  • A theoretical model validated experimental results, showing aggregates reach stable positions quickly.

Conclusions:

  • Balloon-assisted blood flow control effectively reduces flow rates, enhancing MRN steering.
  • The study demonstrated the feasibility of MRN for selective embolization using magnetized microparticle aggregates.
  • This research is a significant step towards clinical application of MRN-based embolization techniques.