Title :
A 4.7-T magnet with a 0.3 M bore for P-31 magnetic resonance spectroscopic imaging
Author :
Maeda, H. ; Urata, M. ; Wada, T. ; Yazawa, T. ; Sato, A.
Author_Institution :
Toshiba Res. & Dev. Center, Kanagawa, Japan
fDate :
3/1/1989 12:00:00 AM
Abstract :
A 0.3-m-bore, 4.7-T, high-homogeneity magnet, used for P-31 magnetic resonance imaging, has been constructed and installed. The magnets are comprised of a set of solenoids, which attained designed 94.8-A current (1.8 MJ) without quenching. Diodes in the cryostat resulted in a fast ramp rate of 3 T in 10 min. The field inhomogeneity for the bare magnet was -250 p.p.m./0.1 m dsv, which was finally reduced to 6 p.p.m./0.1 m dsv by shim coils. The field decay was less than 0.05 p.p.m./h. The magnet system is currently used for P-31 magnetic resonance spectroscopic imaging experiments on living animals in the laboratory
Keywords :
biological techniques and instruments; biomedical NMR; magnetic resonance spectroscopy; superconducting magnets; 0.3 m; 1.8 MJ; 4.7 T; 94.8 A; P-31 magnetic resonance spectroscopic imaging; diodes in cryostat; fast ramp rate; field decay; field inhomogeneity; high-homogeneity magnet; imaging experiments; laboratory; living animals; magnet system; magnetic resonance imaging; set of solenoids; shim coils; superconducting magnets; Boring; Humans; Magnetic field measurement; Magnetic resonance; Magnetic resonance imaging; Magnetic separation; Solenoids; Spectroscopy; Superconducting coils; Superconducting magnets;
Journal_Title :
Magnetics, IEEE Transactions on
