초록 ▼

A superconductive magnet for magnetic resonance imaging not requiring consumable cryogens or requiring cryogen liquid or vapor cooling of superconducting coils is provided having a resin impregnated coil of superconductor wire. Heat conductive means having a thermal conductivity greater than the res

A superconductive magnet for magnetic resonance imaging not requiring consumable cryogens or requiring cryogen liquid or vapor cooling of superconducting coils is provided having a resin impregnated coil of superconductor wire. Heat conductive means having a thermal conductivity greater than the resin, contact the impregnated coil along the length of at least one of the impregnated coil surfaces. A thermal radiation shield is spaced away from and surrounds the resin impregnated coil and heat conductive means. An evacuable housing is spaced away from and surrounds the shield. The housing supports the shield, heat conductive means and the impregnated coil. A multiple stage cryocooler is mounted in the housing with one stage of the cryocooler thermally coupled to the radiation shield and with another stage capable of achieving lower temperatures than the stage coupled to the shield, thermally coupled to the heat conductive means, so that superconductive operation in a vacuum can occur without the coil being immersed in cryogen liquid or vapor.

대표청구항 ▼

A magnet for magnetic resonance imaging not requiring consumable cryogens, cryogen liquid or vapor cooling of superconducting coils comprising; a resin impregnated coil of superconductor wire; heat conductive means, having a thermal conductivity greater than the resin, contacting the impregnated coi

A magnet for magnetic resonance imaging not requiring consumable cryogens, cryogen liquid or vapor cooling of superconducting coils comprising; a resin impregnated coil of superconductor wire; heat conductive means, having a thermal conductivity greater than the resin, contacting the impregnated coil along the length of at least one of the impregnated coil surfaces; a thermal radiation shield spaced away from and surrounding said resin impregnated coil and said heat conductive means; an evacuable housing spaced away from and surrounding said shield, the housing supporting shield, heat conductive means and impregnated coil; and a multiple stage cryocooler mounted in said housing, one stage thermally coupled to said radiation shield, another stage capable of achieving lower temperatures than the other stage thermally coupled to said heat conductive means, whereby said superconductor wire can operate superconductively without quenching in a vacuum without being immersed in cryogen liquid or vapor.