| 摘要 |
PROBLEM TO BE SOLVED: To suppress the influence of useless electromagnetic induction, to evade enlargement, to improve the shield efficiency and shield performance of a shield coil and to be suited to a high-speed imaging method. SOLUTION: This active shield type gradient magnetic field coil (ASGC) unit for MRI(magnetic resonance imaging) is provided with a coil pair constituted of a main coil and the shield coil respectively for an X channel, a Y channel and a Z channel. A gradient magnetic field generated by the main coil is shielded for the respective channels to an external world by a magnetic field for shield generated by the shield coil. For instance, a conductor for forming the winding wire parts CR5-CR8 of the shield coil 12Ys of the Y channel is divided into two and the divided conductors are parallelly wound along a winding pattern. The two divided conductors are wound in non-induction winding to a magnetic flux passed through a closed path formed by the divided conductors.
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