| 摘要 |
Apparatus for irradiating a patient comprises a source of a radiation beam directed along a radiation axis. The source is mounted for pivotable movement about a first horizontal axis substantially normal to the radiation axis, whereby the beam is capable of an angular scan in a vertical plane. In a preferred embodiment the apparatus is positioned so that the midplane between the pole surfaces substantially includes the first horizontal axis. A table is adapted to support a patient to be irradiated. A suspension unit mounts the table for arcuate movement to any of a plurality of positions angularly spaced about the first horizontal axis and for pivoting movement about a second horizontal axis displaced from and substantially parallel to the first horizontal axis. The suspension unit maintains the second horizontal axis in substantially intersecting relation to the radiation axis in each such position while maintaining a fixed angular position of the table with respect to the environment.
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