Field correction of a high-homogeneous field superconducting magnet using a least squares method
Conference
·
· IEEE Trans. Magn.; (United States)
OSTI ID:6340350
A 6th order superconducting solenoid coil has been developed for a whole body magnetic resonance imaging. Nine sets of shim coils are equipped on the solenoid coil. A least squares computer program was applied to determine shim coil currents analytically. After the field correction using shim coils, the homogeneity of 7.6 X 10/sup -6//30 cm DSV was obtained. The effects of ferromagnetic objects on the homogeneity was studied. The error field caused by iron spheres agreed well with the theoretical results. It was found that ferromagnetic objects generated mainly the 1st order error field and this could be corrected by shim coils. The effects of heat and charge/discharge cycles of the magnet on the homogeneity was studied.
- Research Organization:
- Central Research Lab, Mitsubishi Electric Corp. Tsukaguchi-Honmachi, Amagasaki, Hyogo
- OSTI ID:
- 6340350
- Report Number(s):
- CONF-840937-
- Conference Information:
- Journal Name: IEEE Trans. Magn.; (United States) Journal Volume: MAG 21:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420201* -- Engineering-- Cryogenic Equipment & Devices
550600 -- Medicine
62 RADIOLOGY AND NUCLEAR MEDICINE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPUTER CALCULATIONS
COMPUTER CODES
CORRECTIONS
ELECTRIC CHARGES
ELECTRIC COILS
ELECTRIC DISCHARGES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC FIELDS
ELECTROMAGNETS
EQUIPMENT
ERRORS
FERROMAGNETIC MATERIALS
IMAGE PROCESSING
LEAST SQUARE FIT
MAGNETIC MATERIALS
MAGNETIC RESONANCE
MAGNETS
MATERIALS
MAXIMUM-LIKELIHOOD FIT
NUCLEAR MAGNETIC RESONANCE
NUMERICAL SOLUTION
PERFORMANCE
PROCESSING
RESONANCE
SOLENOIDS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
TEMPERATURE EFFECTS
550600 -- Medicine
62 RADIOLOGY AND NUCLEAR MEDICINE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPUTER CALCULATIONS
COMPUTER CODES
CORRECTIONS
ELECTRIC CHARGES
ELECTRIC COILS
ELECTRIC DISCHARGES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC FIELDS
ELECTROMAGNETS
EQUIPMENT
ERRORS
FERROMAGNETIC MATERIALS
IMAGE PROCESSING
LEAST SQUARE FIT
MAGNETIC MATERIALS
MAGNETIC RESONANCE
MAGNETS
MATERIALS
MAXIMUM-LIKELIHOOD FIT
NUCLEAR MAGNETIC RESONANCE
NUMERICAL SOLUTION
PERFORMANCE
PROCESSING
RESONANCE
SOLENOIDS
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
TEMPERATURE EFFECTS