Mobile QR Code QR CODE : The Transactions of the Korean Institute of Electrical Engineers
Title Optimal Design Method for an Actively Shielded MRI Superconducting Magnet
Authors 이광호(Lee, Kwang-Ho) ; 조윤현(Cho, Yun-Hyun)
Page pp.421-430
ISSN 1975-8359
Keywords MRI ; weighted least square (WLS) method ; homogeneity ; active shield method ; passive shield method
Abstract This paper describes an optimal design method which is applied a weighted least square (WLS) method for Magnetic Resonance Imaging (MRI) system. An optimal design approach is presented for a homogeneity superconducting magnet with the superconducting active shield especially for a magnetic resonance imaging system. The WLS is used to obtain the optimal configurations using the least amount and minimum volume of conductor, exhibiting the smallest level of field inhomogeneity and resulting in the least level of stray field. The proposed model is used to design a multiple-shield configuration for a 1.5 T MRI magnet. The field homogeneity is required less than 5 gauss stray field contour within 4m axially and 3m radially from origin. The designed magnet with the actively magnetic shielding coil out of main coils is analyzed by FEM and theoretical analysis method, investigated the field homogeneity.