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A Coaxial RF Applicator for Ultra-High Field Human MRI.

Georgiy Solomakha, Anna Andreychenko, Pierre-Francois van de Moortele

    IEEE Transactions on Bio-Medical Engineering
    |February 5, 2019
    PubMed
    Summary
    This summary is machine-generated.

    A new coaxial resonant cavity radio-frequency (RF) applicator was developed for ultra-high field (UHF) magnetic resonance imaging (MRI). This novel RF coil design is feasible for human MRI at 9.4T, offering a simpler alternative to conventional arrays.

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    Area of Science:

    • Magnetic Resonance Imaging (MRI)
    • Radio-Frequency (RF) Engineering
    • Biomedical Engineering

    Background:

    • Ultra-high field (UHF) magnetic resonance imaging (MRI) offers enhanced signal-to-noise ratio but requires advanced radio-frequency (RF) coil technology.
    • Conventional RF coil arrays for UHF MRI can be complex, necessitating intricate tuning and matching networks.
    • Developing simpler, robust RF coil designs is crucial for advancing UHF MRI applications.

    Purpose of the Study:

    • To introduce a novel coaxial resonant cavity RF concept for UHF human MRI.
    • To evaluate the feasibility and performance of this coaxial applicator for 9.4T MRI.
    • To assess the potential of this design as an alternative to conventional RF arrays.

    Main Methods:

    • Design and numerical electromagnetic modeling of a two-channel slotted coaxial cavity RF applicator for 9.4T human head MRI.
    • Assessment of RF safety using representative human body models.
    • Experimental validation through gradient echo imaging and RF magnetic field mapping on a 9.4T scanner using a human head phantom.

    Main Results:

    • The coaxial applicator resonated at the target frequency without the need for lumped tuning elements.
    • Simulations and phantom experiments showed good agreement, confirming the design's validity.
    • Transmit efficiency and homogeneity were comparable to conventional 8-channel head arrays, with only moderate reductions (20% and 4%, respectively).

    Conclusions:

    • The developed coaxial RF applicator is a feasible and robust solution for UHF human MRI.
    • This design simplifies RF coil construction by minimizing the need for lumped elements.
    • The imaging performance is adequate for applications like anatomical referencing in heteronuclei MRI.