| 摘要 |
A magnet apparatus has an active magnetic shield or a cancel coil disposed coaxially with a main coil at an end portion thereof so that the structure of the magnet apparatus is simplified and the both coils are easily assembled together. The outer diameter of the magnet apparatus is rendered small because it is unnecessary to increase the radius of the apparatus. No misalignment between the main coil and the cancel coil occurs due to an assembly error and/or a magnetomotive force generated when the coils are excited, whereby the static magnetic field is prevented from being distributed unevenly and the tomographic image is refrained from being deteriorated.
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