MRI magnetic field generator
First Claim
1. An MRI-use magnetic field generator which comprises:
- magnetic path-formation members that form a magnetic circuit, a plurality of permanent magnets which generate a magnetic field within an imaging space located within said magnetic circuit, a heating means located within at least one of said magnetic path-formation members and said plurality of permanent magnets, a temperature sensor for detecting a temperature of at least one of said magnetic path-formation members and said plurality of permanent magnets, and a temperature regulator for regulating the temperature of said heating means based on a temperature detected by said temperature sensor.
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Accused Products
Abstract
An MRI-use magnetic field generator structured such that there is no loss of magnetic field uniformity, temperature fluctuation is reduced and thermal efficiency enhanced, and the temperature of the permanent magnets can be controlled to high precision. With this invention, temperature control heaters are embedded in the base yokes of magnetic path formation members, and as a result of this structure, when the temperature control heaters are heated by a temperature regulator according to the temperature detected by a temperature sensor, the permanent magnets disposed in the vicinity of the base yokes are heated efficiently, so control follow-up is excellent. Furthermore, because the temperature control heaters are embedded inside the base yokes, and the heat generated by the heaters is conducted through the base yokes and reaches the permanent magnets directly, the heat is not diffused to the outside and lost, affording extremely efficient thermal control.
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Citations
15 Claims
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1. An MRI-use magnetic field generator which comprises:
- magnetic path-formation members that form a magnetic circuit, a plurality of permanent magnets which generate a magnetic field within an imaging space located within said magnetic circuit, a heating means located within at least one of said magnetic path-formation members and said plurality of permanent magnets, a temperature sensor for detecting a temperature of at least one of said magnetic path-formation members and said plurality of permanent magnets, and a temperature regulator for regulating the temperature of said heating means based on a temperature detected by said temperature sensor.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
Specification