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    High dielectric constant (HDC) sleeves placed outside MRI radiofrequency (RF) coils reduce radiofrequency power deposition and electric fields. This innovation enhances MRI safety and performance in high-field systems.

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    Area of Science:

    • Magnetic Resonance Imaging (MRI)
    • Electromagnetism
    • Materials Science

    Background:

    • High dielectric constant (HDC) materials improve high-field MRI by reducing specific absorption rate (SAR), increasing magnetic field strength, and enhancing signal-to-noise ratio.
    • Previous HDC implementations inside RF coils limited space.

    Purpose of the Study:

    • To investigate an alternative approach using an HDC-based sleeve placed outside the RF coil.
    • To evaluate the impact of external HDC sleeves on electromagnetic fields and SAR in high-field MRI.

    Main Methods:

    • Numerical simulations of electromagnetic (EM) fields with and without an HDC sleeve on a human head model.
    • Experimental EM measurements at 128 MHz using a custom head coil with a distilled water HDC sleeve.

    Main Results:

    • Numerical simulations demonstrated up to a 40% reduction in maximum 10 g-averaged SAR on the head model surface using barium titanate.
    • Experimental measurements showed up to a 20% decrease in maximum electric field with a distilled water sleeve.

    Conclusions:

    • An external HDC sleeve is a viable method to reduce EM field effects in high-field MRI.
    • This technique can be integrated into the design of transmit RF coils for improved high-field MRI systems.