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Multichannel Double-Row Transmission Line Array for Human MR Imaging at Ultrahigh Fields.

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    A novel double-row microstrip transmission line (MTL) transceive array design expands imaging coverage and enhances parallel imaging performance in ultrahigh field MRI. This advancement benefits large-channel-count arrays for improved human MRI scans.

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    Area of Science:

    • Magnetic Resonance Imaging (MRI)
    • Radiofrequency (RF) Coil Engineering
    • Electromagnetics

    Background:

    • Microstrip transmission line (MTL) transceive arrays in ultrahigh field MRI are limited in imaging coverage by resonant frequency constraints.
    • Increasing array length is often necessary to expand coverage but presents design challenges.

    Purpose of the Study:

    • To enhance imaging coverage and parallel imaging capabilities in ultrahigh field MRI.
    • To investigate the efficacy of a double-row MTL transceive array design.

    Main Methods:

    • A 16-channel double-row MTL transceive array was designed and constructed for 7 T human head imaging.
    • Induced current elimination and magnetic wall decoupling techniques were employed for inter-row element isolation.
    • In vivo imaging and g-factor analysis were performed to assess array performance.

    Main Results:

    • Excellent decoupling between coil elements was achieved (better than -18 dB transmission coefficient).
    • The double-row array improved image quality in the lower human head region.
    • Low g-factors were observed, indicating robust parallel imaging performance even at high acceleration factors.

    Conclusions:

    • The double-row MTL array offers increased z-direction imaging coverage compared to single-row designs.
    • Improved parallel imaging capabilities were demonstrated, making it suitable for large-channel-count arrays.
    • This design enhances overall imaging performance in human MRI applications.