| 摘要 |
An MRI magnetic field generator so constructed as to enhance a heat efficiency by reducing variations in temperature without a sacrifice in magnetic field uniformity and to be able to control a permanent magnet temperature with high accuracy, comprising temperature controlling heaters (10, 11) embedded and incorporated in base yolks (3, 3) which form magnetic path forming members, wherein, when the temperature controlling heaters (10, 11) are heated by a temperature controller according to temperatures detected by a temperature sensor (12), permanent magnets (5, 5) disposed in the vicinities of the base yolks are heated efficiently to thereby provide an excellent control follow-up and wherein heat from heaters is conducted through the base yolks to directly reach the permanent magnets to thereby permit very efficient heat control without heat loss due to heat dissipation to the outside.
|
