Title :
Optimized configurations for passively shielded magnetic resonance imaging magnets
Author_Institution :
General Electric Corp. Res. & Dev., Schenectady, NY, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
A design approach is presented for the development of passive shields for coil configurations, with particular emphasis on those used for magnetic resonance imaging (MRI). The approach is based on minimizing the weight of the shield by ensuring that the shield material is everywhere near saturation. A mathematical model is developed to describe the shielding efficiency of a cylindrical shield as a function of shield geometry and type of shield material. The model is used to develop a possible multiple-shield configuration for a 1.5-T MRI magnet
Keywords :
biomedical NMR; coils; electromagnets; magnetic shielding; nuclear magnetic resonance imaging; 1.5 T; MRI; coil configurations; cylindrical shield; design; magnetic resonance imaging; mathematical model; medical imaging; multiple-shield configuration; optimised configuration; passively shielded magnetic resonance imaging magnets; saturation; shield geometry; shield material; shielding efficiency; weight minimisation; Coils; Geometry; Helium; Impedance; Magnetic field measurement; Magnetic materials; Magnetic resonance imaging; Magnetic shielding; Magnets; Mathematical model;
Journal_Title :
Magnetics, IEEE Transactions on
