Optimal design of MRI magnets with magnetic shielding

Conference · Wed Mar 01 00:00:00 EST 1989 · IEEE Trans. Magn.; (United States)

OSTI ID:6005337

Ishiyama, A; Hondon, M; Ishida, N; Onuki, T

The authors have been developing a novel optimal design method for a highly homogeneous superconducting coil system with magnetic shielding for Magnetic Resonance Imaging (MRI). The presented optimal design method is based on a combination of the hybrid finite - boundary element method for analysis of an axially symmetric nonlinear open boundary magnetic field problem and the mathematical programming method for solving the corresponding optimization problem. In this paper, the goal programming method and the nonlinear least squares method have been adopted. The relative merits of a combination of an active shielding and a room shielding have been investigated. The proposed design method can optimize both an MRI magnet and its magnetic shielding system simultaneously taking into account the maximum permissible intensity of stray field at a specified distance from the magnet center. Several design procedures and results of a 1-tesla-magnet system are shown.

• Research Organization: 6782700
• OSTI ID: 6005337
• Report Number(s): CONF-880812-
• Journal Information: IEEE Trans. Magn.; (United States), Vol. 25:2; Conference: Applied superconductivity conference, San Francisco, CA, USA, 21-25 Aug 1988
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
47 OTHER INSTRUMENTATION
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
NMR IMAGING
MAGNETIC SHIELDING
SUPERCONDUCTING COILS
DESIGN
SUPERCONDUCTIVITY
CALCULATION METHODS
FINITE ELEMENT METHOD
LEAST SQUARE FIT
MATHEMATICAL LOGIC
NONLINEAR PROBLEMS
OPTIMIZATION
PROGRAMMING
SUPERCONDUCTING MAGNETS
DIAGNOSTIC TECHNIQUES
ELECTRIC CONDUCTIVITY
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTROMAGNETS
EQUIPMENT
MAGNETS
MAXIMUM-LIKELIHOOD FIT
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
SHIELDING
SUPERCONDUCTING DEVICES
420201* - Engineering- Cryogenic Equipment & Devices
440300 - Miscellaneous Instruments- (-1989)
656100 - Condensed Matter Physics- Superconductivity