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    A novel magnetic wall filter effectively decouples radio-frequency (RF) coils in ultra-high field magnetic resonance imaging (MRI) arrays. This innovation suppresses unwanted energy transfer between coils, improving imaging performance at 7T.

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    Area of Science:

    • Medical Imaging
    • Electromagnetics
    • RF Engineering

    Background:

    • Ultra-high field (≥ 7T) magnetic resonance imaging (MRI) faces radio-frequency (RF) challenges.
    • Multi-channel transmit coil arrays are crucial for parallel RF transmission and tailored excitation.
    • Mutual coupling between coils in RF arrays hinders performance.

    Purpose of the Study:

    • To introduce and validate a novel decoupling method for multi-channel RF transmit arrays.
    • To suppress mutual coupling in RF arrays using a bandstop filter, termed "magnetic wall" (MW).
    • To analyze and experimentally verify the performance of the MW decoupling technique at 7T.

    Main Methods:

    • A novel bandstop filter ("magnetic wall") inspired by periodic resonator designs was implemented.
    • Equivalent circuit analysis was used to model both magnetic and electric coupling.
    • Frequency- and time-domain full-wave simulations were performed.
    • Experimental validation was conducted on a three-coil 7T array setup.

    Main Results:

    • The magnetic wall filter effectively suppressed RF energy transmission between array coils.
    • The MW rejection band was tunable, providing high isolation.
    • Both first-order and higher-order coupling were successfully mitigated.
    • Experimental results confirmed the simulation predictions.

    Conclusions:

    • The proposed magnetic wall filter is an effective solution for decoupling coils in ultra-high field MRI RF transmit arrays.
    • This method significantly reduces mutual coupling, enhancing parallel RF transmission capabilities.
    • The MW technique offers a tunable approach to improve RF array performance and imaging quality at 7T.