| 摘要 |
It is an object of the present invention to provide 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 10 and 11 are embedded in the base yokes 3 of magnetic path formation members, and as a result of this structure, when the temperature control heaters 10 and 11 are heated by a temperature regulator according to the temperature detected by a temperature sensor 12, the permanent magnets 5 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. <IMAGE>
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