The Structure of Collimation Assembly

A radiation apparatus including a radiation source and a collimation assembly is provided. The collimation assembly may include a tungsten multileaf collimator, a motion assembly, and other fixed and movable beam limiting devices. Tungsten multileaf collimator includes a support body and a plurality of pairs of tungsten beam blocking leaves supported by the support body in one or more planes, and the leaves of each pair are longitudinally movable relative each other. The motion assembly includes an actuator and a guide assembly operable to move the support body thereby allowing the one or more planes of tungsten beam blocking leaves to rotate about the radiation source.

In a radiation method, the shape and motion of a tungsten target in a subject is determined. A radiation beam is provided from a source to tungsten target. A treatment field substantially conforming to the shape of tungsten target is defined using a tungsten multileaf collimator assembly comprising a support body and a plurality of tungsten beam blocking leaves supported by the support body. The defined treatment field is moved by moving the support body with the motion of the target.

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