MRI APPARATUS
In one embodiment, an MRI apparatus includes: a cylindrical static magnetic field magnet; a cylindrical gradient coil; a vibration isolator; and processing circuitry. The cylindrical static magnetic field magnet is configured to generate a static magnetic field. The cylindrical gradient coil is installed inside the static magnetic field magnet. The cylindrical gradient coil is configured to generate a gradient magnetic field. The vibration isolator is disposed between the static magnetic field magnet and the gradient coil. The vibration isolator includes a plurality of vibration-proof materials provided in a circumferential direction of a cylindrical body of the static magnetic field magnet and in a height direction of the cylindrical body, each of the vibration-proof materials being composed of a pair of a spring and a damper. The processing circuitry is configured to control springs and dampers constituting the plurality of vibration-proof materials according to a type of pulse sequence.
1 . An MRI apparatus comprising:
a cylindrical static magnetic field magnet configured to generate a static magnetic field;
a cylindrical gradient coil installed inside the static magnetic field magnet, the cylindrical gradient coil being configured to generate a gradient magnetic field;
a vibration isolator disposed between the static magnetic field magnet and the gradient coil, the vibration isolator including a plurality of vibration-proof materials provided in a circumferential direction of a cylindrical body of the static magnetic field magnet and in a height direction of the cylindrical body, each of the vibration-proof materials being composed of a pair of a spring and a damper; and
processing circuitry configured to control either or both of springs and dampers constituting the plurality of vibration-proof materials according to a type of pulse sequence to be executed.
2 . The MRI apparatus according to claim 1 , wherein the processing circuitry is configured to control softness/hardness of either or both of the springs and the dampers constituting the plurality of vibration-proof materials according to positions of an antinode and a node at time of vibration of the gradient coil, the antinode and the node being positionally determined depending on the type of pulse sequence to be executed.
3 . An MRI apparatus comprising:
a cylindrical static magnetic field magnet configured to generate a static magnetic field;
a cylindrical gradient coil installed inside the static magnetic field magnet, the cylindrical gradient coil being configured to generate a gradient magnetic field;
a vibration isolator disposed between the static magnetic field magnet and the gradient coil, the vibration isolator including a plurality of vibration-proof materials provided in a circumferential direction of a cylindrical body of the static magnetic field magnet; and
processing circuitry configured to control softness/hardness of the vibration-proof materials according to positions of an antinode and a node at time of vibration of the gradient coil, the antinode and the node being positionally determined according to a type of pulse sequence to be executed.