| 摘要 |
PROBLEM TO BE SOLVED: To prevent an artifact due to a magnetic field outside an effective image pickup range by taking a side where the end whose distance from the center of space is shorter exists as the side for applying a gradient magnetic field in the same direction as the magnetostatic field among the end parts of an object to be image-picked up on one and the other sides related to the center of space. SOLUTION: An object to be image-picked up is loaded on an image pickup table, and carried in the internal space of a magnetostatic field generating part. At this time, when the waist of the object 8 to be image-picked up exists in the peripheral area (d), a magnetic resonance signal produced in that part causes an artifact. Then, by a switching device in the gradient driving part, the polarity of the gradient driving signal is switched. That is, the side where the end whose distance from the center O of space is shorter exists is taken as the side for applying a gradient magnetic field (d) in the same direction as the static magnetic field (a). In this condition, the peripheral area (d) is positioned at the tip of the head of the object 8 to be image- picked up. Therefore, the image pickup object 8 does not exist in the peripheral area (d), so that a magnetic resonance signal causes the artifact is not produced.
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