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Description
3.0T Head-Only Superconducting magnetic resonance imaging (MRI) is under developed at the Wuhan National High Magnetic Field Center (WHMFC). Gradient coils, which generate linear gradient magnetic fields orthogonal to each other along the X, Y, and Z directions, are critical components of MRI systems. However, existing asymmetric gradient coil designs often encounter challenges, including excessive wire density on one side, which complicates coil winding and introduces gradient magnetic field distortions near the target area's edges, resulting in increased field non-uniformity. To address these issues, this paper proposes a multilayer self-shielding gradient coil design method. This approach incorporates an additional auxiliary coil layer on the densely wound side to jointly generate the target magnetic field with the main coil. Tikhonov regularization is employed to impose constraints and optimize gradient coil performance. A custom algorithm was developed to implement this design methodology, yielding a gradient coil system that is both winding-friendly and high-performing. The Z-direction coil utilizes a cylindrical configuration, while the X- and Y-direction coils feature saddle-shaped designs.
