| 摘要 |
The present invention provides a compact, lightweight, and easy-to-use ESR-CT apparatus including a magnetic field leak line (5-G line), the apparatus being capable of imaging a small animal, such as a mouse, within 15 minutes with a spatial resolution of 1 mm or less and observing a desired region with a spatial resolution of 1 mm or less. A permanent magnet system for magnetic space is introduced, the system comprising: pole pieces having a predetermined area which are opposed to each other through a space; yokes combined with the pole pieces; and a permanent magnet inserted in series in a closed magnetic circuit formed by the pole pieces, the yokes, and a space between the pole pieces so that a magnetic pole plane intersects perpendicularly to the closed magnetic circuit for magnetic coupling with the yokes. This makes it possible to locate a gradient coil system sufficiently apart from end faces of the pole pieces, downsize a field scanning coil system, locate the field scanning coil system sufficiently apart from end faces of the pole pieces, and accordingly makes the gradient field system movable.
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