| 摘要 |
PROBLEM TO BE SOLVED: To shelter magnetic interference of imaging area of superconductive magnet in a magnetic resonance imaging equipment. SOLUTION: A superconductive magnet 30 of a cryogenic medium re-condensing magnetic resonance imaging equipment utilizes both cryo-cooler 10 of rare earth element displacement material and a superconductive sleeve surrounding a part of circle of low temperature end of the cryo-cooler, a superconductive electric current induced by movement of the rare earth displacer is generated and an antagonistic magnetic field is produced. The antagonistic magnetic field shelters the imaging area of the superconductive magnet from the magnetic interference generated by movement of the rare earth displacer of the cryo- cooler. |
