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    A new robotic system precisely positions active shim coils within MRI scanners, significantly reducing artifacts caused by Implanted Cardioverter Defibrillators (ICDs). This improves cardiac MRI quality for better patient diagnosis and treatment planning.

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    Area of Science:

    • Medical Imaging
    • Robotics
    • Biomedical Engineering

    Background:

    • Implanted Cardioverter Defibrillators (ICDs) create magnetic field inhomogeneities in MRI scanners, causing artifacts that obscure cardiac images.
    • Existing MRI scanner shim coils cannot correct these ICD-induced artifacts, limiting diagnostic accuracy.

    Purpose of the Study:

    • To develop and assess an MR-safe robotic solution for automated, patient-specific positioning of active shim coils.
    • To compensate for magnetic field inhomogeneity caused by ICDs and improve cardiac MRI quality.

    Main Methods:

    • Designed and fabricated an MR-safe Cartesian robotic platform using plastics and fiberglass, actuated by pneumatic motors.
    • The platform provides decoupled translations for precise shim coil placement within the MRI scanner.
    • Control electronics are located outside the scanner room to ensure MR safety.

    Main Results:

    • The robotic platform demonstrated high precision with <2 mm average motion error and 0.5 mm repeatability.
    • Significantly reduced shim coil adjustment time from 5 minutes to a few seconds.
    • Successfully positioned a heavy shim coil in phantom and animal trials, improving Implanted Cardioverter Defibrillator artifact suppression.

    Conclusions:

    • The developed robotic platform offers an effective and reliable method for precise shim coil positioning inside MRI scanners.
    • This technology enhances cardiac MRI quality, aiding in accurate diagnosis and treatment planning for patients with ICDs.