| 摘要 |
PROBLEM TO BE SOLVED: To provide an MRI apparatus for making a temperature distribution of a magnetic material hold plate 14 even without narrowing an image pickup area and attenuating a fluctuation magnetic field while generating small eddy current. SOLUTION: The MRI apparatus includes: a magnet for generating a static magnetic field in an image pickup area of a subject; a gradient magnetic field coil for making pulse current flow to generate a magnetic field where magnetic field intensity is gradient in the image pickup area, a low temperature area where heat is unevenly generated, and a high temperature area which is higher in temperature than the low temperature area; and a magnetic material hold plate 14 which is disposed along the gradient magnetic field coil, holds a plurality of magnetic materials 13, and improves the evenness of the static magnetic field. The magnetic material hold plate 14 is an excellent conductor provided with slits 19, has a high temperature approximate area 29 close to the high temperature area and low temperature approximate areas 37, 38 close to the low temperature area. The slits 19 are provided so as not to cross between the high temperature approximate area 29 and the low temperature approximate areas 37, 38. COPYRIGHT: (C)2011,JPO&INPIT |
