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Design and Optimization of Gradient Coils for Low-field Halbach Array Scanners Using the Discrete Wire Method.

Haile Baye Kassahun, Maureen Nayebare, Timon Machtelinckx

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 3, 2025
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a discrete wire approach for designing efficient gradient coils for Halbach array scanners, enhancing magnetic resonance (MR) imaging quality. The new method improves coil efficiency and linearity for portable, low-field scanners.

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    Area of Science:

    • Medical Imaging
    • Magnetics Engineering
    • Applied Physics

    Background:

    • Halbach array magnets are crucial for homogeneous fields in portable, low-field magnetic resonance (MR) scanners.
    • Efficient gradient coil design is essential for high-quality MR imaging, but challenges exist in achieving linearity and efficiency for axial coils.
    • Current methods face limitations in optimizing gradient coils for specific diameters of spherical volumes (DSV) in Halbach array systems.

    Purpose of the Study:

    • To investigate a discrete wire approach for designing efficient gradient coils tailored for Halbach array scanners.
    • To optimize gradient coils for enhanced efficiency and linearity within a specified DSV.
    • To address the limitations of existing target field methods for axial gradient coil design.

    Main Methods:

    • Parameterized coil turns using quasi-elliptic functions for both transverse and axial gradient coils.
    • Optimized gradient coils to maximize efficiency while maintaining linearity error <10% and maximum field deviation <5%.
    • Utilized coil geometric parameters, current, turn locations, quadrant center, and quasi-elliptic parameters as design variables.

    Main Results:

    • Designed Y, X, and Z (axial) gradient coils achieved efficiencies of 2.84 mT/m/A, 2.40 mT/m/A, and 1.21 mT/m/A, respectively.
    • Achieved these efficiencies over a cylindrical volume of 6 cm length and 6 cm diameter.
    • Demonstrated a viable method for designing gradient coils that meet specific performance criteria.

    Conclusions:

    • The discrete wire approach offers an effective strategy for designing efficient gradient coils for Halbach array scanners.
    • This method shows promise for improving MR image quality in portable, low-field applications.
    • Further research will explore its application in diffusion-weighted imaging (DWI) for low-field MR systems.