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Design and Optimization of Superconducting MRI Magnet Systems With Magnetic Materials

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2 Author(s)
Tadic, T. ; Med. Phys. Dept., Cross Cancer Inst., Edmonton, AB, Canada ; Fallone, B.G.

We present a method for the optimal design of superconducting magnet systems for magnetic resonance imaging (MRI). The method integrates a linear-programming technique with the finite-element method (FEM) to calculate minimum-volume coil configurations subject to magnetic field homogeneity constraints for MRI systems that contain general nonaxisymmetric magnetic yoke structures. The method rapidly converges and only requires a small number of iterations and FEM analyses to be performed. In particular, the method is well suited for magnet design problems that necessitate large 3-D FEM models. We demonstrate the method with the optimal design of an open and compact 0.5 T yoked biplanar magnet assembly considered for use in an integrated medical linear accelerator and MRI system. In particular, the coil configuration for this magnet design is constructed from a MgB2 high-temperature superconducting material that operates in a conduction-cooled cryogen-free environment.

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Applied Superconductivity, IEEE Transactions on  (Volume:22 ,  Issue: 2 )