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Quantification and 3D Localization of Magnetically Navigated Superparamagnetic Particles Using MRI in Phantom and

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    Magnetic drug-eluting beads (MDEBs) were accurately quantified and localized using 3D VIBE MRI sequences. This method enables precise tracking of SPIONs for targeted cancer therapy delivery.

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    Area of Science:

    • Biomedical Engineering
    • Nanotechnology
    • Medical Imaging

    Background:

    • Superparamagnetic iron oxide nanoparticles (SPIONs) are utilized in magnetic drug-eluting beads (MDEBs) for targeted cancer therapy.
    • Magnetic navigation within MRI scanners offers potential for precise delivery of MDEBs through the vascular system.

    Purpose of the Study:

    • To develop and validate a method for accurate quantification and localization of MDEBs using MRI.
    • To assess the feasibility of magnetically steering MDEBs to specific regions within the body.

    Main Methods:

    • MDEBs composed of Fe3O4 SPIONs were created and characterized.
    • Susceptibility artifacts in 3D VIBE MRI sequences were analyzed in phantoms and swine models.
    • A linear volume relationship between MDEB artifacts and MDEB quantity was established.
    • Magnetic-injection systems were used for in vivo MDEB steering and embolization.

    Main Results:

    • A robust linear volume relationship was identified between MDEB artifacts and MDEB quantity, independent of magnetic field orientation and sequence bandwidth.
    • The method demonstrated high accuracy (≤ 8.8% error) in quantifying MDEB distribution.
    • Successful magnetic steering of MDEBs to desired liver regions was achieved in a swine model.

    Conclusions:

    • MDEBs can be effectively steered to target locations using magnetic guidance.
    • 3D VIBE MRI sequences coupled with artifact analysis provide accurate localization and quantification of MDEB distribution.
    • This technique holds promise for image-guided, targeted delivery of cancer therapeutics.