Patent ID: 7323962

Claim:
A magnet for a magnetic resonance imaging system comprising: a field yoke for forming flux loop; a first member of permanent magnet, provided on one end of the field yoke, a free end of which is inclined inwardly; a second member of permanent magnet, provided on the other end of the field yoke in symmetry with the first member of permanent magnet, having reverse polarity with the first member of permanent magnet in order to generate a magnetic field in association with the first member of permanent magnet, a free end of which is inclined inwardly, wherein an open area for accommodating a sample is formed between the free ends of the first member of permanent magnet and the second member of permanent magnet; and an adjusting block, provided on the center of the field yoke for forming magnetic flux to extrude the magnetic field formed by the first member of permanent magnet and the second member of permanent magnet in the open area; wherein the adjusting block is divided into two parts symmetrically provided relative to the centerline of the field yoke under the open area, each of which has identical polarity with the first/second member of permanent magnet to be adjacent; wherein each part of the adjusting block comprises: a slab of permanent magnet for generating the magnetic flux for deforming the magnetic field generated by the first member of permanent magnet and the second member of permanent magnet; and a magnetic conductor, provided on the field yoke for supporting the slab of permanent magnet and for assisting the magnetic flux generated by the slab of permanent magnet to form a flux loop.