Title :
Analysis of magnetic characteristics of permanent magnet assembly for MRI devices taking account of hysteresis and eddy current
Author :
Miyata, Koji ; Ohashi, Ken ; Takahashi, Norio ; Ukita, Hideaki
Author_Institution :
Magnetic Mater. R&D Center, Shin-Etsu Chem. Co. Ltd., Takefu, Japan
fDate :
9/1/1998 12:00:00 AM
Abstract :
The flux distribution of a permanent magnet type of MRI (magnetic resonance imaging) is affected by the hysteresis (minor loop) and eddy current in a pole piece due to the pulse current of the gradient coil. In this paper, a simple modeling technique of the minor loop is presented, and the effect of hysteresis and eddy current on the residual flux density of the probe coil is examined
Keywords :
NMR imaging; coils; eddy currents; magnetic devices; magnetic flux; magnetic hysteresis; permanent magnets; probes; MRI devices; eddy current; finite element method; flux distribution; gradient coil; hysteresis; magnetic characteristics; magnetic resonance imaging; minor loop; permanent magnet assembly; pole piece; probe coil; pulse current; residual flux density; Assembly; Coils; Eddy currents; Finite element methods; Magnetic analysis; Magnetic devices; Magnetic flux; Magnetic resonance imaging; Magnetization; Permanent magnets;
Journal_Title :
Magnetics, IEEE Transactions on
