| 摘要 |
An MRI apparatus that includes an open magnet system with pole pieces ( 14, 16 ) for generating a steady B<SUB>0 </SUB>magnetic field in an examination zone ( 13 ). Gradient coil systems ( 18, 20 ) are disposed above and below the examination zone ( 13 ) and adjacent the pole pieces. First and second resonators ( 22, 24 ) are disposed between the gradient coil systems ( 18, 20 ) and the examination zone ( 13 ). RF screens ( 26, 28 ) are disposed between the gradient coil systems ( 18, 20 ) and the planar resonators ( 22, 24 ). The planar resonators each include a central conductor ( 30 ), such as a circular plate and an annular ring ( 32 ) surrounding and co-planar with the central conductor. Radial rungs ( 33 ) connect and are co-planar with the central conductor and annular ring. Capacitors ( 34 ), preferably numbering in the thousands, interrupt the rungs.
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