| 摘要 |
A magnet system used for magnetic resonance imaging comprises a magnetic coil energizable to establish a magnetic field and a contoured insert of ferromagnetic material positioned within the coil. The insert is substantially dish-shaped and has a top surface contoured with radial transitions from a flat portion, to a concave portion, to a convex portion, to provide a uniform magnetic field within a target zone located at the center of the front surface. A method is also disclosed for determining the proper contour to achieve high uniform magnetic field within the target zone.
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