| 摘要 |
<p>A closed magnetic resonance imaging (MRI) magnet has a single superconductive coil assembly (12) including a coil housing (14) containing a cryogenic fluid dewar (28) containing a pair of longitudinally-outermost impregnated superconductive main coils (32,34) and at-least-one cryostable additional superconductive coil such as a pair of additional main coils (42,44), a pair of bucking coils (36,38), and/or a pair of shielding coils (46,48). An open MRI magnet has two spaced-apart superconductive coil assemblies and an imaging volume have a centre. Each coil assembly has a cryostable superconductive main coil and an impregnated bucking coil with the impregnated bucking coil being the closest superconductive coil to the centre of the imaging volume. <IMAGE></p> |
