Superconducting magnet and magnetic resonance imaging apparatus

Abstract

The present invention provides superconducting magnet apparatus, which being capable of suppressing smaller change of magnetic materials temperature and reducing variation of magnetic field uniformity and in the other hand being capable of changing temperature of magnetic materials in a short time, relative to long time room temperature variation. In a superconducting magnet, including a superconducting coil (11a,11b) for generating a magnetic field, a coil vessel (9) together with freezing medium (14) for holding the superconducting coil (11a,11b), a vacuum vessel (3) for holding the coil vessel, and magnetic materials (12a,12b,13a,13b) disposed inside the vacuum vessel supported with thermal insulation for compensating the magnetic field, comprising a first heat supply and absorption section (44) disposed outside the vacuum vessel and thermally coupled to the vacuum vessel for supplying to or absorbing heat from the vacuum vessel; and first thermal conducting materials (25,27) thermally coupled to the magnetic materials and the vacuum vessel, which being disposed inside the vacuum vessel.

Description

technical field [0001] The present invention relates to a superconducting magnet device and a magnetic resonance imaging (hereinafter referred to as "MRI") device using the same, and more particularly to an open-type superconducting magnet device suitable for MRI analysis that does not cause a sense of clogging to a subject and an MRI device using it. Background technique [0002] The MRI device uses the phenomenon of nuclear magnetic resonance (Nuclear Magnetic Resonance, hereinafter referred to as "NMR") to measure the electromagnetic waves emitted by the spin of the hydrogen nucleus, and calculates the electromagnetic waves as signals to perform tomographic imaging of the subject based on the density of the hydrogen nucleus. [0003] The strength of the electromagnetic field obtained from the electromagnetic wave emitted by the hydrogen nucleus spin is proportional to the strength of the static magnetic field in the measurement area, so it is necessary to increase the str...

AI Technical Summary

Problems solved by technology

[0009] (2) Since the temperature of the magnetic material changes only steadily, if the superconducting magnet device is transported and reinstalled elsewhere, the temperature of the magnetic material may rise due to the external air temperature during transport.

In this way, when the temperature of the magnetic material changes due to any reason, the temperature of the magnetic material becomes very unstable afterwards, and it will take a long time until the uniformity of the magnetic field becomes constant, and it cannot return to the temperature of the magnetic material in a short time. temperature

Images