Optimal Design of an MRI Device Considering the Homogeneity of the Magnetic Field

자기장의 균일성을 고려한 자기공명장치의 최적설계

  • 이정훈 (연세대학교 기계공학과 대학원) ;
  • 유정훈 (연세대학교 기계공학부)
  • Published : 2008.08.01


This paper is to suggest a concept design of the permanent magnet type magnetic resonance imaging (MRI) device based on the parameter optimization method. Pulse currents in the gradient coils will introduce the effect of eddy currents in the ferromagnetic material, which will worsen the quality of imaging. In order to equalize the magnetic flux in the MRI device for good imaging, the eddy current effect in the ferromagnetic material must be taken into account. This study attempts to use the design of experiment (DOE) and the response surface method (RSM) for equalizing the magnetic flux of the permanent magnet type MRI device using that the magnetic flux can be calculated directly using a commercial finite element analysis package. As a result, optimal shapes of the pole and the yoke of the PM type MRI device can be obtained. The commercial package, ANSYS, is used for analyzing the magnetic field problem and obtaining the resultant magnetic flux.


Magnetic Resonance Imaging;Magn;etic Field;Design of Experiment;Response Surface Method;Finite Element Analysis


  1. Cheng, D., K., 1993, Fundamentals of Engineering Electromagnetics, Prentice-Hall Inc., Upper Saddle River, New Jersey
  2. Takahashi, N., Suenaga, R., Miyata, K. and Ohashi, K., 2003, “Analysis of the Magnetic Property of a Permanent-Magnet-Type MRI Behavior of Residual Magnetization,” IEEE Trans. Magn., Vol. 39, No. 3, pp.1337-1340
  3. Lee, C.-Y., Yoo, J. and S. Min, 2006, “Design of Swing-arm type Actuator using the Compliant Mechanism–Multi-objective Optimal Design Considering the Stiffness Effect,” Trans. KSME, Vol. 30, No. 2, pp.128-134
  4. Lee, J., H., Park, S., J., Jeon, S., J., 2006, “Optimum design criteria for a synchronous reluctance motor with concentrated winding using response surface methodology”, Journal of Applied Physics 99, 08R325
  5. Myers R. H. and Montgomery D. C., 1995, Response Surface Methodology, John Wiley & Sons. Inc., New York
  6. Wang, X., Xie, D. and Bai, B., 2007, “Analysis of Magnetic Field of MRI Device Taking Account of Anisotropy and Hysteresis,” Proceedings of International Conference on Electrical Machines and Systems, pp. 1410-1413
  7. Fowlkes, W., Y. and Creveling, C., M., 1995, Engineering methods for robust product design using Taguchi methods in technology and product development, Addison-Wesley Publishing, Reading, Massachusetts

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