| 摘要 |
PROBLEM TO BE SOLVED: To provide an magnetic system with few increase in number of parts and manufacturing steps, preventing a transition to normal conduction caused by resin cracks, and having shielding effect to an external magnetic field. SOLUTION: In the magnetic system of a magnetic resonance imaging system passing predetermined electric current through a plurality of coaxially arranged coils and generating a uniform magnetic field in a predetermined space in the inner diameter sides of the plurality of coils, at least one of the coils is constituted by winding a first wire material 21 for passing current for generating the uniform magnetic field and a second wire material 22 insulated from the first wire material 21 around the same coil bobbin 8 (or 11). A closed loop circuit passing the induction current generated in the coil of the second wire material 22 by the external magnetic field in the same direction is constituted, by serially connecting the second wire material 22. Further the second wire material 22 with a small wire diameter is wound in the gaps of the first wire materials. COPYRIGHT: (C)2008,JPO&INPIT |
