TY - JOUR
T1 - The application of accurate calculation of magnetic field intensity in 1.5-T superconducting MRI magnet design
AU - Feng, Zhongkui
AU - Li, Lankai
AU - Gao, Chunjie
AU - Zhu, Guang
AU - Li, Yi
AU - Li, Xian
AU - Dai, Yinming
AU - Wang, Qiuliang
PY - 2012
Y1 - 2012
N2 - Currently, when calculating the magnetic field generated by the solenoid coil of the superconducting wire wound, we assume that the coil cross section with a uniform current density, but actual current in superconducting wires (NbTi) in the form of a wire in channel is not evenly distributed, the current distribution only in the superconducting core, i.e., there is no current in copper, insulation, and filler, and this method of calculation will result in errors. In this paper, we model the superconducting cores of the 1.5-T superconducting magnetic resonance imaging (MRI) magnet to calculate accurate magnetic field intensity and inhomogeneity by helicoidal method in the diameter of spherical volume and find that inhomogeneity is eight times bigger than that calculated by spherical harmonic expansions, which cannot be accepted in design. Hence, in order to design a high-homogeneity MRI magnet, we amend the 1.5-T MRI magnet's original parameters by an optimization algorithm through an original interface between OPERA-3D and MATLAB according to the accurate results.
AB - Currently, when calculating the magnetic field generated by the solenoid coil of the superconducting wire wound, we assume that the coil cross section with a uniform current density, but actual current in superconducting wires (NbTi) in the form of a wire in channel is not evenly distributed, the current distribution only in the superconducting core, i.e., there is no current in copper, insulation, and filler, and this method of calculation will result in errors. In this paper, we model the superconducting cores of the 1.5-T superconducting magnetic resonance imaging (MRI) magnet to calculate accurate magnetic field intensity and inhomogeneity by helicoidal method in the diameter of spherical volume and find that inhomogeneity is eight times bigger than that calculated by spherical harmonic expansions, which cannot be accepted in design. Hence, in order to design a high-homogeneity MRI magnet, we amend the 1.5-T MRI magnet's original parameters by an optimization algorithm through an original interface between OPERA-3D and MATLAB according to the accurate results.
KW - Accurate calculation
KW - Helicoidal method (HM)
KW - Inhomogeneity
KW - Optimization algorithm
KW - Spherical harmonic expansions (SHE)
UR - https://www.scopus.com/pages/publications/84870456121
U2 - 10.1109/TASC.2012.2223464
DO - 10.1109/TASC.2012.2223464
M3 - 文章
AN - SCOPUS:84870456121
SN - 1051-8223
VL - 22
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
IS - 6
M1 - 4402206
ER -