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High-resolution MR imaging using loop-gap resonators. Work in progress.

J B Kneeland, A Jesmanowicz, W Froncisz

    Radiology
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    Loop-gap resonators (LGRs) enable high-resolution magnetic resonance imaging (MRI). Different LGR geometries were tested, with butterfly and planar pairs showing superior decoupling for advanced MRI applications.

    Area of Science:

    • Medical Imaging
    • Biophysics
    • Electrical Engineering

    Background:

    • High-resolution magnetic resonance imaging (MRI) requires specialized receiver coils.
    • Loop-gap resonators (LGRs) offer potential for improved signal reception and spatial resolution in MRI.

    Purpose of the Study:

    • To evaluate different loop-gap resonator (LGR) geometries for high-resolution MRI.
    • To assess the performance of LGRs as receiver coils in a 1.5-T MRI system.

    Main Methods:

    • Four LGR geometries were investigated: flat single loops, coplanar (planar pair) loops, coaxial (axial pair) loops, and symmetrically angled (butterfly pair) loops.
    • LGRs were used as receiver coils with the body coil as transmitter.
    • Coil performance was evaluated using field distribution analysis and human subject imaging.

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    Main Results:

    • Representative high-resolution MR imaging results (0.6 mm x 0.6 mm pixel size) were achieved.
    • Butterfly and planar pair LGRs demonstrated intrinsic decoupling from transmitted fields of arbitrary orientation.
    • Single loop and axial pair LGRs showed decoupling from linearly polarized, orthogonal fields.

    Conclusions:

    • LGR configurations, particularly butterfly and planar pairs, are effective for high-resolution MRI.
    • Optimizing coil sensitivity to match anatomical regions is crucial for maximizing imaging performance.
    • These findings advance the development of advanced receiver coils for specialized MRI applications.