| 摘要 |
A magnetically shielded cryostat, e.g. in a MRI imaging apparatus, has a heat-insulating tank (7) having an outer wall. A magnetic shield (17,24) is spaced from the tank, covers at least partly the outer wall of the tank and is not supported by the tank. A refrigerator (10) having a cooled member (13,14) extends into the tank (7). In order to avoid direct transmission of vibration of the refrigerator (10) to a centre region of the shield (17,24), the refrigerator is supported on the magnetic shield by at least one elongate support member (18b) connected to the shield only at or close to the ends of the shield. <IMAGE>
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