MULTILEAF COLLIMATOR, AND RADIATION THERAPY APPARATUS AND RADIATION THERAPY SYSTEM USING SAME

摘要

A multileaf collimator includes leaves extending in a first direction; a frame supporting the leaves so that the leaves are advanceable and retractable in a state where the leaves are placed side by side in a second direction perpendicular to the first direction; shafts extending in the second direction and corresponding to the leaves; driving units respectively connected to base ends of the shafts for rotating the shafts around axial lines; and driving units provided at tips of the shafts and contacting portions of the leaves for advancing and retracting the leaves in the first direction by the rotation of the shafts around the axial lines. At least some of the shafts have the same shaft length. The driving units are arranged so that the positions thereof in the second direction are shifted from each other according to the positions of the tips of the shafts having the same length.

主权项

1. A multileaf collimator comprising:
a plurality of leaves that extend in a first direction; a frame that supports the plurality of leaves so that the plurality of leaves are individually advanceable and retractable in a state where the plurality of leaves are placed side by side in a second direction perpendicular to the first direction; a plurality of shafts that extend in the second direction and are provided to correspond to the plurality of leaves, respectively; a plurality of driving units that are respectively connected to first ends of the plurality shafts in directions of axial lines and rotate the shafts around the axial lines; and advance and retraction driving sections that are provided at second ends of the shafts in the directions of the axial lines, contact portions of the leaves, and advance and retract the leaves in the first direction by the rotation of the shafts around the axial lines, wherein at least some of the plurality of shafts have the same shaft length as each other, and wherein the plurality of driving units are arranged so that the positions thereof in the second direction are shifted from each other according to the positions of the second ends of the plurality of shafts having the same length.