| 摘要 |
PROBLEM TO BE SOLVED: To provide a diaphragm device for adjusting the irradiation region of radiations capable of improving the irradiation accuracy of the irradiation region. SOLUTION: The diaphragm device 1 provided inside an irradiation head for emitting X-rays of the radiation therapy apparatus has a pair of diaphragm blocks 10, and a pair of multileaf collimators 20 provided on an extension passing through the diaphragm blocks 10 from a ray source 126. The multileaf collimator 20 comprises a plurality of planar leaves 21, a plurality of air bearings 22 formed so that the planar leaves 21 can be held at two positions, in the Y direction and Z direction of the planar leaves 21, a gear mechanism 23 formed so that each planar leaf 21 can independently be turned around the ray source 126, and a guide part 24 for guiding the planar leaves 21 in a thickness direction. COPYRIGHT: (C)2009,JPO&INPIT
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