SUPERCONDUCTIVE MAGNET DEVICE AND MAGNETIC RESONANCE IMAGING DEVICE USING IT

摘要

PROBLEM TO BE SOLVED: To provide an MRI device of a high magnetic field which is excellent in magnetic field uniformity and is capable of sufficiently securing a refrigerating performance.

SOLUTION: A pulse tube refrigerator is adopted and a valve unit is installed in a place of a low experience magnetic field. For instance, the valve unit is installed on the ceiling of a shield room, or the valve unit is arranged at a connection column which connects a set of coil containers so as to oppose each other. By the MRI device of this invention, a sufficient refrigerating performance is obtained without adversely affecting the magnetic field uniformity of an imaging space.

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